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gecko/layout/generic/nsTextFrameThebes.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Robert O'Callahan <robert@ocallahan.org>
* Roger B. Sidje <rbs@maths.uq.edu.au>
* Pierre Phaneuf <pp@ludusdesign.com>
* Prabhat Hegde <prabhat.hegde@sun.com>
* Tomi Leppikangas <tomi.leppikangas@oulu.fi>
* Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
* Daniel Glazman <glazman@netscape.com>
* Neil Deakin <neil@mozdevgroup.com>
* Masayuki Nakano <masayuki@d-toybox.com>
* Mats Palmgren <mats.palmgren@bredband.net>
* Uri Bernstein <uriber@gmail.com>
* Stephen Blackheath <entangled.mooched.stephen@blacksapphire.com>
* Michael Ventnor <m.ventnor@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* rendering object for textual content of elements */
#include "nsCOMPtr.h"
#include "nsHTMLParts.h"
#include "nsCRT.h"
#include "nsSplittableFrame.h"
#include "nsLineLayout.h"
#include "nsString.h"
#include "nsUnicharUtils.h"
#include "nsPresContext.h"
#include "nsIContent.h"
#include "nsStyleConsts.h"
#include "nsStyleContext.h"
#include "nsCoord.h"
#include "nsIFontMetrics.h"
#include "nsIRenderingContext.h"
#include "nsIPresShell.h"
#include "nsITimer.h"
#include "nsVoidArray.h"
#include "nsIDOMText.h"
#include "nsIDocument.h"
#include "nsIDeviceContext.h"
#include "nsCSSPseudoElements.h"
#include "nsCompatibility.h"
#include "nsCSSColorUtils.h"
#include "nsLayoutUtils.h"
#include "nsDisplayList.h"
#include "nsFrame.h"
#include "nsTextFrameUtils.h"
#include "nsTextRunTransformations.h"
#include "nsFrameManager.h"
#include "nsTextFrameTextRunCache.h"
#include "nsExpirationTracker.h"
#include "nsTextFrame.h"
#include "nsICaseConversion.h"
#include "nsIUGenCategory.h"
#include "nsUnicharUtilCIID.h"
#include "nsTextFragment.h"
#include "nsGkAtoms.h"
#include "nsFrameSelection.h"
#include "nsISelection.h"
#include "nsIDOMRange.h"
#include "nsILookAndFeel.h"
#include "nsCSSRendering.h"
#include "nsContentUtils.h"
#include "nsLineBreaker.h"
#include "nsIWordBreaker.h"
#include "nsILineIterator.h"
#include "nsIServiceManager.h"
#ifdef ACCESSIBILITY
#include "nsIAccessible.h"
#include "nsIAccessibilityService.h"
#endif
#include "nsAutoPtr.h"
#include "nsStyleSet.h"
#include "nsBidiFrames.h"
#include "nsBidiPresUtils.h"
#include "nsBidiUtils.h"
#include "nsIThebesFontMetrics.h"
#include "gfxFont.h"
#include "gfxContext.h"
#include "gfxTextRunWordCache.h"
#include "gfxImageSurface.h"
#ifdef NS_DEBUG
#undef NOISY_BLINK
#undef NOISY_REFLOW
#undef NOISY_TRIM
#else
#undef NOISY_BLINK
#undef NOISY_REFLOW
#undef NOISY_TRIM
#endif
// The following flags are set during reflow
// This bit is set on the first frame in a continuation indicating
// that it was chopped short because of :first-letter style.
#define TEXT_FIRST_LETTER 0x00100000
// This bit is set on frames that are logically adjacent to the start of the
// line (i.e. no prior frame on line with actual displayed in-flow content).
#define TEXT_START_OF_LINE 0x00200000
// This bit is set on frames that are logically adjacent to the end of the
// line (i.e. no following on line with actual displayed in-flow content).
#define TEXT_END_OF_LINE 0x00400000
// This bit is set on frames that end with a hyphenated break.
#define TEXT_HYPHEN_BREAK 0x00800000
// This bit is set on frames that trimmed trailing whitespace characters when
// calculating their width during reflow.
#define TEXT_TRIMMED_TRAILING_WHITESPACE 0x01000000
// Set this bit if the textframe has overflow area for IME/spellcheck underline.
#define TEXT_SELECTION_UNDERLINE_OVERFLOWED 0x04000000
#define TEXT_REFLOW_FLAGS \
(TEXT_FIRST_LETTER|TEXT_START_OF_LINE|TEXT_END_OF_LINE|TEXT_HYPHEN_BREAK| \
TEXT_TRIMMED_TRAILING_WHITESPACE|TEXT_HAS_NONCOLLAPSED_CHARACTERS| \
TEXT_SELECTION_UNDERLINE_OVERFLOWED)
// Cache bits for IsEmpty().
// Set this bit if the textframe is known to be only collapsible whitespace.
#define TEXT_IS_ONLY_WHITESPACE 0x08000000
// Set this bit if the textframe is known to be not only collapsible whitespace.
#define TEXT_ISNOT_ONLY_WHITESPACE 0x10000000
#define TEXT_WHITESPACE_FLAGS 0x18000000
// This bit is set while the frame is registered as a blinking frame.
#define TEXT_BLINK_ON 0x80000000
/*
* Some general notes
*
* Text frames delegate work to gfxTextRun objects. The gfxTextRun object
* transforms text to positioned glyphs. It can report the geometry of the
* glyphs and paint them. Text frames configure gfxTextRuns by providing text,
* spacing, language, and other information.
*
* A gfxTextRun can cover more than one DOM text node. This is necessary to
* get kerning, ligatures and shaping for text that spans multiple text nodes
* but is all the same font. The userdata for a gfxTextRun object is a
* TextRunUserData* or an nsIFrame*.
*
* We go to considerable effort to make sure things work even if in-flow
* siblings have different style contexts (i.e., first-letter and first-line).
*
* Our convention is that unsigned integer character offsets are offsets into
* the transformed string. Signed integer character offsets are offsets into
* the DOM string.
*
* XXX currently we don't handle hyphenated breaks between text frames where the
* hyphen occurs at the end of the first text frame, e.g.
* <b>Kit&shy;</b>ty
*/
/**
* We use an array of these objects to record which text frames
* are associated with the textrun. mStartFrame is the start of a list of
* text frames. Some sequence of its continuations are covered by the textrun.
* A content textnode can have at most one TextRunMappedFlow associated with it
* for a given textrun.
*
* mDOMOffsetToBeforeTransformOffset is added to DOM offsets for those frames to obtain
* the offset into the before-transformation text of the textrun. It can be
* positive (when a text node starts in the middle of a text run) or
* negative (when a text run starts in the middle of a text node). Of course
* it can also be zero.
*/
struct TextRunMappedFlow {
nsTextFrame* mStartFrame;
PRInt32 mDOMOffsetToBeforeTransformOffset;
// The text mapped starts at mStartFrame->GetContentOffset() and is this long
PRUint32 mContentLength;
};
/**
* This is our user data for the textrun, when textRun->GetFlags() does not
* have TEXT_SIMPLE_FLOW set. When TEXT_SIMPLE_FLOW is set, there is just one
* flow, the textrun's user data pointer is a pointer to mStartFrame
* for that flow, mDOMOffsetToBeforeTransformOffset is zero, and mContentLength
* is the length of the text node.
*/
struct TextRunUserData {
TextRunMappedFlow* mMappedFlows;
PRInt32 mMappedFlowCount;
PRUint32 mLastFlowIndex;
};
/**
* This helper object computes colors used for painting, and also IME
* underline information. The data is computed lazily and cached as necessary.
* These live for just the duration of one paint operation.
*/
class nsTextPaintStyle {
public:
nsTextPaintStyle(nsTextFrame* aFrame);
nscolor GetTextColor();
/**
* Compute the colors for normally-selected text. Returns false if
* the normal selection is not being displayed.
*/
PRBool GetSelectionColors(nscolor* aForeColor,
nscolor* aBackColor);
void GetHighlightColors(nscolor* aForeColor,
nscolor* aBackColor);
void GetIMESelectionColors(PRInt32 aIndex,
nscolor* aForeColor,
nscolor* aBackColor);
// if this returns PR_FALSE, we don't need to draw underline.
PRBool GetIMEUnderline(PRInt32 aIndex,
nscolor* aLineColor,
float* aRelativeSize,
PRUint8* aStyle);
nsPresContext* PresContext() { return mPresContext; }
enum {
eIndexRawInput = 0,
eIndexSelRawText,
eIndexConvText,
eIndexSelConvText
};
protected:
nsTextFrame* mFrame;
nsPresContext* mPresContext;
PRPackedBool mInitCommonColors;
PRPackedBool mInitSelectionColors;
// Selection data
PRInt16 mSelectionStatus; // see nsIDocument.h SetDisplaySelection()
nscolor mSelectionTextColor;
nscolor mSelectionBGColor;
// Common data
PRInt32 mSufficientContrast;
nscolor mFrameBackgroundColor;
// IME selection colors and underline info
struct nsIMEStyle {
PRBool mInit;
nscolor mTextColor;
nscolor mBGColor;
nscolor mUnderlineColor;
PRUint8 mUnderlineStyle;
};
nsIMEStyle mIMEStyle[4];
// indices
float mIMEUnderlineRelativeSize;
// Color initializations
void InitCommonColors();
PRBool InitSelectionColors();
nsIMEStyle* GetIMEStyle(PRInt32 aIndex);
void InitIMEStyle(PRInt32 aIndex);
PRBool EnsureSufficientContrast(nscolor *aForeColor, nscolor *aBackColor);
nscolor GetResolvedForeColor(nscolor aColor, nscolor aDefaultForeColor,
nscolor aBackColor);
};
static void
DestroyUserData(void* aUserData)
{
TextRunUserData* userData = static_cast<TextRunUserData*>(aUserData);
if (userData) {
nsMemory::Free(userData);
}
}
// Remove the textrun from the frame continuation chain starting at aFrame,
// which should be marked as a textrun owner.
static void
ClearAllTextRunReferences(nsTextFrame* aFrame, gfxTextRun* aTextRun)
{
while (aFrame) {
if (aFrame->GetTextRun() != aTextRun)
break;
aFrame->SetTextRun(nsnull);
aFrame = static_cast<nsTextFrame*>(aFrame->GetNextContinuation());
}
}
// Figure out which frames
static void
UnhookTextRunFromFrames(gfxTextRun* aTextRun)
{
if (!aTextRun->GetUserData())
return;
// Kill all references to the textrun. It could be referenced by any of its
// owners, and all their in-flows.
if (aTextRun->GetFlags() & nsTextFrameUtils::TEXT_IS_SIMPLE_FLOW) {
nsIFrame* firstInFlow = static_cast<nsIFrame*>(aTextRun->GetUserData());
ClearAllTextRunReferences(static_cast<nsTextFrame*>(firstInFlow), aTextRun);
} else {
TextRunUserData* userData =
static_cast<TextRunUserData*>(aTextRun->GetUserData());
PRInt32 i;
for (i = 0; i < userData->mMappedFlowCount; ++i) {
ClearAllTextRunReferences(userData->mMappedFlows[i].mStartFrame, aTextRun);
}
DestroyUserData(userData);
}
aTextRun->SetUserData(nsnull);
}
class FrameTextRunCache;
static FrameTextRunCache *gTextRuns = nsnull;
/*
* Cache textruns and expire them after 3*10 seconds of no use.
*/
class FrameTextRunCache : public nsExpirationTracker<gfxTextRun,3> {
public:
enum { TIMEOUT_SECONDS = 10 };
FrameTextRunCache()
: nsExpirationTracker<gfxTextRun,3>(TIMEOUT_SECONDS*1000) {}
~FrameTextRunCache() {
AgeAllGenerations();
}
void RemoveFromCache(gfxTextRun* aTextRun) {
if (aTextRun->GetExpirationState()->IsTracked()) {
RemoveObject(aTextRun);
}
if (aTextRun->GetFlags() & gfxTextRunWordCache::TEXT_IN_CACHE) {
gfxTextRunWordCache::RemoveTextRun(aTextRun);
}
}
// This gets called when the timeout has expired on a gfxTextRun
virtual void NotifyExpired(gfxTextRun* aTextRun) {
UnhookTextRunFromFrames(aTextRun);
RemoveFromCache(aTextRun);
delete aTextRun;
}
};
static gfxTextRun *
MakeTextRun(const PRUnichar *aText, PRUint32 aLength,
gfxFontGroup *aFontGroup, const gfxFontGroup::Parameters* aParams,
PRUint32 aFlags)
{
nsAutoPtr<gfxTextRun> textRun;
if (aLength == 0) {
textRun = aFontGroup->MakeEmptyTextRun(aParams, aFlags);
} else if (aLength == 1 && aText[0] == ' ') {
textRun = aFontGroup->MakeSpaceTextRun(aParams, aFlags);
} else {
textRun = gfxTextRunWordCache::MakeTextRun(aText, aLength, aFontGroup,
aParams, aFlags);
}
if (!textRun)
return nsnull;
nsresult rv = gTextRuns->AddObject(textRun);
if (NS_FAILED(rv)) {
gTextRuns->RemoveFromCache(textRun);
return nsnull;
}
return textRun.forget();
}
static gfxTextRun *
MakeTextRun(const PRUint8 *aText, PRUint32 aLength,
gfxFontGroup *aFontGroup, const gfxFontGroup::Parameters* aParams,
PRUint32 aFlags)
{
nsAutoPtr<gfxTextRun> textRun;
if (aLength == 0) {
textRun = aFontGroup->MakeEmptyTextRun(aParams, aFlags);
} else if (aLength == 1 && aText[0] == ' ') {
textRun = aFontGroup->MakeSpaceTextRun(aParams, aFlags);
} else {
textRun = gfxTextRunWordCache::MakeTextRun(aText, aLength, aFontGroup,
aParams, aFlags);
}
if (!textRun)
return nsnull;
nsresult rv = gTextRuns->AddObject(textRun);
if (NS_FAILED(rv)) {
gTextRuns->RemoveFromCache(textRun);
return nsnull;
}
return textRun.forget();
}
nsresult
nsTextFrameTextRunCache::Init() {
gTextRuns = new FrameTextRunCache();
return gTextRuns ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
}
void
nsTextFrameTextRunCache::Shutdown() {
delete gTextRuns;
gTextRuns = nsnull;
}
PRInt32 nsTextFrame::GetContentEnd() const {
nsTextFrame* next = static_cast<nsTextFrame*>(GetNextContinuation());
return next ? next->GetContentOffset() : mContent->GetText()->GetLength();
}
PRInt32 nsTextFrame::GetInFlowContentLength() {
#ifdef IBMBIDI
nsTextFrame* nextBidi = nsnull;
PRInt32 start = -1, end;
if (mState & NS_FRAME_IS_BIDI) {
nextBidi = static_cast<nsTextFrame*>(GetLastInFlow()->GetNextContinuation());
if (nextBidi) {
nextBidi->GetOffsets(start, end);
return start - mContentOffset;
}
}
#endif //IBMBIDI
return mContent->TextLength() - mContentOffset;
}
// Smarter versions of XP_IS_SPACE.
// Unicode is really annoying; sometimes a space character isn't whitespace ---
// when it combines with another character
// So we have several versions of IsSpace for use in different contexts.
static PRBool IsSpaceCombiningSequenceTail(const nsTextFragment* aFrag, PRUint32 aPos)
{
NS_ASSERTION(aPos <= aFrag->GetLength(), "Bad offset");
if (!aFrag->Is2b())
return PR_FALSE;
return nsTextFrameUtils::IsSpaceCombiningSequenceTail(
aFrag->Get2b() + aPos, aFrag->GetLength() - aPos);
}
// Check whether aPos is a space for CSS 'word-spacing' purposes
static PRBool IsCSSWordSpacingSpace(const nsTextFragment* aFrag, PRUint32 aPos)
{
NS_ASSERTION(aPos < aFrag->GetLength(), "No text for IsSpace!");
PRUnichar ch = aFrag->CharAt(aPos);
if (ch == ' ' || ch == CH_CJKSP)
return !IsSpaceCombiningSequenceTail(aFrag, aPos + 1);
return ch == '\t' || ch == '\n' || ch == '\f';
}
// Check whether the string aChars/aLength starts with a space that's
// trimmable according to CSS 'white-space'.
static PRBool IsTrimmableSpace(const PRUnichar* aChars, PRUint32 aLength)
{
NS_ASSERTION(aLength > 0, "No text for IsSpace!");
PRUnichar ch = *aChars;
if (ch == ' ')
return !nsTextFrameUtils::IsSpaceCombiningSequenceTail(aChars + 1, aLength - 1);
return ch == '\t' || ch == '\n' || ch == '\f';
}
// Check whether the character aCh is trimmable according to CSS 'white-space'
static PRBool IsTrimmableSpace(char aCh)
{
return aCh == ' ' || aCh == '\t' || aCh == '\n' || aCh == '\f';
}
static PRBool IsTrimmableSpace(const nsTextFragment* aFrag, PRUint32 aPos)
{
NS_ASSERTION(aPos < aFrag->GetLength(), "No text for IsSpace!");
PRUnichar ch = aFrag->CharAt(aPos);
if (ch == ' ')
return !IsSpaceCombiningSequenceTail(aFrag, aPos + 1);
return ch == '\t' || ch == '\n' || ch == '\f';
}
static PRBool IsTrimmableSpace(const nsTextFragment* aFrag,
const nsStyleText* aText, PRUint32 aPos)
{
if (aText->WhiteSpaceIsSignificant())
return PR_FALSE;
return IsTrimmableSpace(aFrag, aPos);
}
static PRBool IsSelectionSpace(const nsTextFragment* aFrag, PRUint32 aPos)
{
NS_ASSERTION(aPos < aFrag->GetLength(), "No text for IsSpace!");
PRUnichar ch = aFrag->CharAt(aPos);
if (ch == ' ' || ch == CH_NBSP)
return !IsSpaceCombiningSequenceTail(aFrag, aPos + 1);
return ch == '\t' || ch == '\n' || ch == '\f';
}
// Count the amount of trimmable whitespace in a text fragment. The first
// character is at offset aStartOffset; the maximum number of characters
// to check is aLength. aDirection is -1 or 1 depending on whether we should
// progress backwards or forwards.
static PRUint32
GetTrimmableWhitespaceCount(const nsTextFragment* aFrag, PRInt32 aStartOffset,
PRInt32 aLength, PRInt32 aDirection)
{
PRInt32 count = 0;
if (aFrag->Is2b()) {
const PRUnichar* str = aFrag->Get2b() + aStartOffset;
PRInt32 fragLen = aFrag->GetLength() - aStartOffset;
for (; count < aLength; ++count) {
if (!IsTrimmableSpace(str, fragLen))
break;
str += aDirection;
fragLen -= aDirection;
}
} else {
const char* str = aFrag->Get1b() + aStartOffset;
for (; count < aLength; ++count) {
if (!IsTrimmableSpace(*str))
break;
str += aDirection;
}
}
return count;
}
/**
* This class accumulates state as we scan a paragraph of text. It detects
* textrun boundaries (changes from text to non-text, hard
* line breaks, and font changes) and builds a gfxTextRun at each boundary.
* It also detects linebreaker run boundaries (changes from text to non-text,
* and hard line breaks) and at each boundary runs the linebreaker to compute
* potential line breaks. It also records actual line breaks to store them in
* the textruns.
*/
class BuildTextRunsScanner {
public:
BuildTextRunsScanner(nsPresContext* aPresContext, gfxContext* aContext,
nsIFrame* aLineContainer) :
mCurrentFramesAllSameTextRun(nsnull),
mContext(aContext),
mLineContainer(aLineContainer),
mBidiEnabled(aPresContext->BidiEnabled()),
mTrimNextRunLeadingWhitespace(PR_FALSE),
mSkipIncompleteTextRuns(PR_FALSE) {
ResetRunInfo();
}
void SetAtStartOfLine() {
mStartOfLine = PR_TRUE;
mCanStopOnThisLine = PR_FALSE;
}
void SetSkipIncompleteTextRuns(PRBool aSkip) {
mSkipIncompleteTextRuns = aSkip;
}
void SetCommonAncestorWithLastFrame(nsIFrame* aFrame) {
mCommonAncestorWithLastFrame = aFrame;
}
PRBool CanStopOnThisLine() {
return mCanStopOnThisLine;
}
nsIFrame* GetCommonAncestorWithLastFrame() {
return mCommonAncestorWithLastFrame;
}
void LiftCommonAncestorWithLastFrameToParent(nsIFrame* aFrame) {
if (mCommonAncestorWithLastFrame &&
mCommonAncestorWithLastFrame->GetParent() == aFrame) {
mCommonAncestorWithLastFrame = aFrame;
}
}
void ScanFrame(nsIFrame* aFrame);
PRBool IsTextRunValidForMappedFlows(gfxTextRun* aTextRun);
void FlushFrames(PRBool aFlushLineBreaks, PRBool aSuppressTrailingBreak);
void ResetRunInfo() {
mLastFrame = nsnull;
mMappedFlows.Clear();
mLineBreakBeforeFrames.Clear();
mMaxTextLength = 0;
mDoubleByteText = PR_FALSE;
}
void ResetLineBreaker() {
PRBool trailingBreak;
mLineBreaker.Reset(&trailingBreak);
}
void AccumulateRunInfo(nsTextFrame* aFrame);
/**
* @return null to indicate either textrun construction failed or
* we constructed just a partial textrun to set up linebreaker and other
* state for following textruns.
*/
gfxTextRun* BuildTextRunForFrames(void* aTextBuffer);
void AssignTextRun(gfxTextRun* aTextRun);
nsTextFrame* GetNextBreakBeforeFrame(PRUint32* aIndex);
void SetupBreakSinksForTextRun(gfxTextRun* aTextRun, PRBool aIsExistingTextRun,
PRBool aSuppressSink);
struct FindBoundaryState {
nsIFrame* mStopAtFrame;
nsTextFrame* mFirstTextFrame;
nsTextFrame* mLastTextFrame;
PRPackedBool mSeenTextRunBoundaryOnLaterLine;
PRPackedBool mSeenTextRunBoundaryOnThisLine;
PRPackedBool mSeenSpaceForLineBreakingOnThisLine;
};
enum FindBoundaryResult {
FB_CONTINUE,
FB_STOPPED_AT_STOP_FRAME,
FB_FOUND_VALID_TEXTRUN_BOUNDARY
};
FindBoundaryResult FindBoundaries(nsIFrame* aFrame, FindBoundaryState* aState);
PRBool ContinueTextRunAcrossFrames(nsTextFrame* aFrame1, nsTextFrame* aFrame2);
// Like TextRunMappedFlow but with some differences. mStartFrame to mEndFrame
// (exclusive) are a sequence of in-flow frames (if mEndFrame is null, then
// continuations starting from mStartFrame are a sequence of in-flow frames).
struct MappedFlow {
nsTextFrame* mStartFrame;
nsTextFrame* mEndFrame;
// When we consider breaking between elements, the nearest common
// ancestor of the elements containing the characters is the one whose
// CSS 'white-space' property governs. So this records the nearest common
// ancestor of mStartFrame and the previous text frame, or null if there
// was no previous text frame on this line.
nsIFrame* mAncestorControllingInitialBreak;
PRInt32 GetContentEnd() {
return mEndFrame ? mEndFrame->GetContentOffset()
: mStartFrame->GetContent()->GetText()->GetLength();
}
};
class BreakSink : public nsILineBreakSink {
public:
BreakSink(gfxTextRun* aTextRun, gfxContext* aContext, PRUint32 aOffsetIntoTextRun,
PRBool aExistingTextRun) :
mTextRun(aTextRun), mContext(aContext),
mOffsetIntoTextRun(aOffsetIntoTextRun),
mChangedBreaks(PR_FALSE), mExistingTextRun(aExistingTextRun) {}
virtual void SetBreaks(PRUint32 aOffset, PRUint32 aLength,
PRPackedBool* aBreakBefore) {
if (mTextRun->SetPotentialLineBreaks(aOffset + mOffsetIntoTextRun, aLength,
aBreakBefore, mContext)) {
mChangedBreaks = PR_TRUE;
// Be conservative and assume that some breaks have been set
mTextRun->ClearFlagBits(nsTextFrameUtils::TEXT_NO_BREAKS);
}
}
virtual void SetCapitalization(PRUint32 aOffset, PRUint32 aLength,
PRPackedBool* aCapitalize) {
NS_ASSERTION(mTextRun->GetFlags() & nsTextFrameUtils::TEXT_IS_TRANSFORMED,
"Text run should be transformed!");
nsTransformedTextRun* transformedTextRun =
static_cast<nsTransformedTextRun*>(mTextRun);
transformedTextRun->SetCapitalization(aOffset + mOffsetIntoTextRun, aLength,
aCapitalize, mContext);
}
gfxTextRun* mTextRun;
gfxContext* mContext;
PRUint32 mOffsetIntoTextRun;
PRPackedBool mChangedBreaks;
PRPackedBool mExistingTextRun;
};
private:
nsAutoTArray<MappedFlow,10> mMappedFlows;
nsAutoTArray<nsTextFrame*,50> mLineBreakBeforeFrames;
nsAutoTArray<nsAutoPtr<BreakSink>,10> mBreakSinks;
nsLineBreaker mLineBreaker;
gfxTextRun* mCurrentFramesAllSameTextRun;
gfxContext* mContext;
nsIFrame* mLineContainer;
nsTextFrame* mLastFrame;
// The common ancestor of the current frame and the previous leaf frame
// on the line, or null if there was no previous leaf frame.
nsIFrame* mCommonAncestorWithLastFrame;
// mMaxTextLength is an upper bound on the size of the text in all mapped frames
PRUint32 mMaxTextLength;
PRPackedBool mDoubleByteText;
PRPackedBool mBidiEnabled;
PRPackedBool mStartOfLine;
PRPackedBool mTrimNextRunLeadingWhitespace;
PRPackedBool mCurrentRunTrimLeadingWhitespace;
PRPackedBool mSkipIncompleteTextRuns;
PRPackedBool mCanStopOnThisLine;
};
static nsIFrame*
FindLineContainer(nsIFrame* aFrame)
{
while (aFrame && aFrame->CanContinueTextRun()) {
aFrame = aFrame->GetParent();
}
return aFrame;
}
static PRBool
TextContainsLineBreakerWhiteSpace(const void* aText, PRUint32 aLength,
PRBool aIsDoubleByte)
{
PRUint32 i;
if (aIsDoubleByte) {
const PRUnichar* chars = static_cast<const PRUnichar*>(aText);
for (i = 0; i < aLength; ++i) {
if (nsLineBreaker::IsSpace(chars[i]))
return PR_TRUE;
}
return PR_FALSE;
} else {
const PRUint8* chars = static_cast<const PRUint8*>(aText);
for (i = 0; i < aLength; ++i) {
if (nsLineBreaker::IsSpace(chars[i]))
return PR_TRUE;
}
return PR_FALSE;
}
}
struct FrameTextTraversal {
nsIFrame* mFrameToDescendInto;
PRPackedBool mDescendIntoFrameSiblings;
PRPackedBool mLineBreakerCanCrossFrameBoundary;
PRPackedBool mTextRunCanCrossFrameBoundary;
};
static FrameTextTraversal
CanTextCrossFrameBoundary(nsIFrame* aFrame, nsIAtom* aType)
{
NS_ASSERTION(aType == aFrame->GetType(), "Wrong type");
FrameTextTraversal result;
PRBool continuesTextRun = aFrame->CanContinueTextRun();
if (aType == nsGkAtoms::placeholderFrame) {
// placeholders are "invisible", so a text run should be able to span
// across one. But don't descend into the out-of-flow.
result.mLineBreakerCanCrossFrameBoundary = PR_TRUE;
if (continuesTextRun) {
// ... Except for first-letter floats, which are really in-flow
// from the point of view of capitalization etc, so we'd better
// descend into them. But we actually need to break the textrun for
// first-letter floats since things look bad if, say, we try to make a
// ligature across the float boundary.
result.mFrameToDescendInto =
(static_cast<nsPlaceholderFrame*>(aFrame))->GetOutOfFlowFrame();
result.mDescendIntoFrameSiblings = PR_FALSE;
result.mTextRunCanCrossFrameBoundary = PR_FALSE;
} else {
result.mFrameToDescendInto = nsnull;
result.mTextRunCanCrossFrameBoundary = PR_TRUE;
}
} else {
if (continuesTextRun) {
result.mFrameToDescendInto = aFrame->GetFirstChild(nsnull);
result.mDescendIntoFrameSiblings = PR_TRUE;
result.mTextRunCanCrossFrameBoundary = PR_TRUE;
result.mLineBreakerCanCrossFrameBoundary = PR_TRUE;
} else {
result.mFrameToDescendInto = nsnull;
result.mTextRunCanCrossFrameBoundary = PR_FALSE;
result.mLineBreakerCanCrossFrameBoundary = PR_FALSE;
}
}
return result;
}
BuildTextRunsScanner::FindBoundaryResult
BuildTextRunsScanner::FindBoundaries(nsIFrame* aFrame, FindBoundaryState* aState)
{
nsIAtom* frameType = aFrame->GetType();
nsTextFrame* textFrame = frameType == nsGkAtoms::textFrame
? static_cast<nsTextFrame*>(aFrame) : nsnull;
if (textFrame) {
if (aState->mLastTextFrame &&
textFrame != aState->mLastTextFrame->GetNextInFlow() &&
!ContinueTextRunAcrossFrames(aState->mLastTextFrame, textFrame)) {
aState->mSeenTextRunBoundaryOnThisLine = PR_TRUE;
if (aState->mSeenSpaceForLineBreakingOnThisLine)
return FB_FOUND_VALID_TEXTRUN_BOUNDARY;
}
if (!aState->mFirstTextFrame) {
aState->mFirstTextFrame = textFrame;
}
aState->mLastTextFrame = textFrame;
}
if (aFrame == aState->mStopAtFrame)
return FB_STOPPED_AT_STOP_FRAME;
if (textFrame) {
if (!aState->mSeenSpaceForLineBreakingOnThisLine) {
const nsTextFragment* frag = textFrame->GetContent()->GetText();
PRUint32 start = textFrame->GetContentOffset();
const void* text = frag->Is2b()
? static_cast<const void*>(frag->Get2b() + start)
: static_cast<const void*>(frag->Get1b() + start);
if (TextContainsLineBreakerWhiteSpace(text, textFrame->GetContentLength(),
frag->Is2b())) {
aState->mSeenSpaceForLineBreakingOnThisLine = PR_TRUE;
if (aState->mSeenTextRunBoundaryOnLaterLine)
return FB_FOUND_VALID_TEXTRUN_BOUNDARY;
}
}
return FB_CONTINUE;
}
FrameTextTraversal traversal =
CanTextCrossFrameBoundary(aFrame, frameType);
if (!traversal.mTextRunCanCrossFrameBoundary) {
aState->mSeenTextRunBoundaryOnThisLine = PR_TRUE;
if (aState->mSeenSpaceForLineBreakingOnThisLine)
return FB_FOUND_VALID_TEXTRUN_BOUNDARY;
}
for (nsIFrame* f = traversal.mFrameToDescendInto; f;
f = f->GetNextSibling()) {
FindBoundaryResult result = FindBoundaries(f, aState);
if (result != FB_CONTINUE)
return result;
if (!traversal.mDescendIntoFrameSiblings)
break;
}
if (!traversal.mTextRunCanCrossFrameBoundary) {
aState->mSeenTextRunBoundaryOnThisLine = PR_TRUE;
if (aState->mSeenSpaceForLineBreakingOnThisLine)
return FB_FOUND_VALID_TEXTRUN_BOUNDARY;
}
return FB_CONTINUE;
}
// build text runs for the 200 lines following aForFrame, and stop after that
// when we get a chance.
#define NUM_LINES_TO_BUILD_TEXT_RUNS 200
/**
* General routine for building text runs. This is hairy because of the need
* to build text runs that span content nodes.
*
* @param aForFrameLine the line containing aForFrame; if null, we'll figure
* out the line (slowly)
* @param aBlockFrame the block containing aForFrame; if null, we'll figure
* out the block (slowly)
*/
static void
BuildTextRuns(gfxContext* aContext, nsTextFrame* aForFrame,
nsIFrame* aLineContainer, const nsLineList::iterator* aForFrameLine)
{
NS_ASSERTION(aForFrame || (aForFrameLine && aLineContainer),
"One of aForFrame or aForFrameLine+aLineContainer must be set!");
if (!aLineContainer || !aForFrameLine) {
aLineContainer = FindLineContainer(aForFrame);
} else {
NS_ASSERTION(!aForFrame || aLineContainer == FindLineContainer(aForFrame), "Wrong line container hint");
}
nsPresContext* presContext = aLineContainer->PresContext();
BuildTextRunsScanner scanner(presContext, aContext, aLineContainer);
nsBlockFrame* block = nsLayoutUtils::GetAsBlock(aLineContainer);
if (!block) {
NS_ASSERTION(!aLineContainer->GetPrevInFlow() && !aLineContainer->GetNextInFlow(),
"Breakable non-block line containers not supported");
// Just loop through all the children of the linecontainer ... it's really
// just one line
scanner.SetAtStartOfLine();
scanner.SetCommonAncestorWithLastFrame(nsnull);
nsIFrame* child = aLineContainer->GetFirstChild(nsnull);
while (child) {
scanner.ScanFrame(child);
child = child->GetNextSibling();
}
// Set mStartOfLine so FlushFrames knows its textrun ends a line
scanner.SetAtStartOfLine();
scanner.FlushFrames(PR_TRUE, PR_FALSE);
return;
}
// Find the line containing aForFrame
PRBool isValid = PR_TRUE;
nsBlockInFlowLineIterator backIterator(block, &isValid);
if (aForFrameLine) {
backIterator = nsBlockInFlowLineIterator(block, *aForFrameLine, PR_FALSE);
} else {
backIterator = nsBlockInFlowLineIterator(block, aForFrame, &isValid);
NS_ASSERTION(isValid, "aForFrame not found in block, someone lied to us");
NS_ASSERTION(backIterator.GetContainer() == block,
"Someone lied to us about the block");
}
nsBlockFrame::line_iterator startLine = backIterator.GetLine();
// Find a line where we can start building text runs. We choose the last line
// where:
// -- there is a textrun boundary between the start of the line and the
// start of aForFrame
// -- there is a space between the start of the line and the textrun boundary
// (this is so we can be sure the line breaks will be set properly
// on the textruns we construct).
// The possibly-partial text runs up to and including the first space
// are not reconstructed. We construct partial text runs for that text ---
// for the sake of simplifying the code and feeding the linebreaker ---
// but we discard them instead of assigning them to frames.
// This is a little awkward because we traverse lines in the reverse direction
// but we traverse the frames in each line in the forward direction.
nsBlockInFlowLineIterator forwardIterator = backIterator;
nsTextFrame* stopAtFrame = aForFrame;
nsTextFrame* nextLineFirstTextFrame = nsnull;
PRBool seenTextRunBoundaryOnLaterLine = PR_FALSE;
PRBool mayBeginInTextRun = PR_TRUE;
while (PR_TRUE) {
forwardIterator = backIterator;
nsBlockFrame::line_iterator line = backIterator.GetLine();
if (!backIterator.Prev() || backIterator.GetLine()->IsBlock()) {
mayBeginInTextRun = PR_FALSE;
break;
}
BuildTextRunsScanner::FindBoundaryState state = { stopAtFrame, nsnull, nsnull,
seenTextRunBoundaryOnLaterLine, PR_FALSE, PR_FALSE };
nsIFrame* child = line->mFirstChild;
PRBool foundBoundary = PR_FALSE;
PRInt32 i;
for (i = line->GetChildCount() - 1; i >= 0; --i) {
BuildTextRunsScanner::FindBoundaryResult result =
scanner.FindBoundaries(child, &state);
if (result == BuildTextRunsScanner::FB_FOUND_VALID_TEXTRUN_BOUNDARY) {
foundBoundary = PR_TRUE;
break;
} else if (result == BuildTextRunsScanner::FB_STOPPED_AT_STOP_FRAME) {
break;
}
child = child->GetNextSibling();
}
if (foundBoundary)
break;
if (!stopAtFrame && state.mLastTextFrame && nextLineFirstTextFrame &&
!scanner.ContinueTextRunAcrossFrames(state.mLastTextFrame, nextLineFirstTextFrame)) {
// Found a usable textrun boundary at the end of the line
if (state.mSeenSpaceForLineBreakingOnThisLine)
break;
seenTextRunBoundaryOnLaterLine = PR_TRUE;
} else if (state.mSeenTextRunBoundaryOnThisLine) {
seenTextRunBoundaryOnLaterLine = PR_TRUE;
}
stopAtFrame = nsnull;
if (state.mFirstTextFrame) {
nextLineFirstTextFrame = state.mFirstTextFrame;
}
}
scanner.SetSkipIncompleteTextRuns(mayBeginInTextRun);
// Now iterate over all text frames starting from the current line. First-in-flow
// text frames will be accumulated into textRunFrames as we go. When a
// text run boundary is required we flush textRunFrames ((re)building their
// gfxTextRuns as necessary).
PRBool seenStartLine = PR_FALSE;
PRUint32 linesAfterStartLine = 0;
do {
nsBlockFrame::line_iterator line = forwardIterator.GetLine();
if (line->IsBlock())
break;
line->SetInvalidateTextRuns(PR_FALSE);
scanner.SetAtStartOfLine();
scanner.SetCommonAncestorWithLastFrame(nsnull);
nsIFrame* child = line->mFirstChild;
PRInt32 i;
for (i = line->GetChildCount() - 1; i >= 0; --i) {
scanner.ScanFrame(child);
child = child->GetNextSibling();
}
if (line.get() == startLine.get()) {
seenStartLine = PR_TRUE;
}
if (seenStartLine) {
++linesAfterStartLine;
if (linesAfterStartLine >= NUM_LINES_TO_BUILD_TEXT_RUNS && scanner.CanStopOnThisLine()) {
// Don't flush; we may be in the middle of a textrun that we can't
// end here. That's OK, we just won't build it.
// Note that we must already have finished the textrun for aForFrame,
// because we've seen the end of a textrun in a line after the line
// containing aForFrame.
scanner.ResetLineBreaker();
return;
}
}
} while (forwardIterator.Next());
// Set mStartOfLine so FlushFrames knows its textrun ends a line
scanner.SetAtStartOfLine();
scanner.FlushFrames(PR_TRUE, PR_FALSE);
}
static PRUnichar*
ExpandBuffer(PRUnichar* aDest, PRUint8* aSrc, PRUint32 aCount)
{
while (aCount) {
*aDest = *aSrc;
++aDest;
++aSrc;
--aCount;
}
return aDest;
}
PRBool BuildTextRunsScanner::IsTextRunValidForMappedFlows(gfxTextRun* aTextRun)
{
if (aTextRun->GetFlags() & nsTextFrameUtils::TEXT_IS_SIMPLE_FLOW)
return mMappedFlows.Length() == 1 &&
mMappedFlows[0].mStartFrame == static_cast<nsTextFrame*>(aTextRun->GetUserData()) &&
mMappedFlows[0].mEndFrame == nsnull;
TextRunUserData* userData = static_cast<TextRunUserData*>(aTextRun->GetUserData());
if (userData->mMappedFlowCount != PRInt32(mMappedFlows.Length()))
return PR_FALSE;
PRUint32 i;
for (i = 0; i < mMappedFlows.Length(); ++i) {
if (userData->mMappedFlows[i].mStartFrame != mMappedFlows[i].mStartFrame ||
PRInt32(userData->mMappedFlows[i].mContentLength) !=
mMappedFlows[i].GetContentEnd() - mMappedFlows[i].mStartFrame->GetContentOffset())
return PR_FALSE;
}
return PR_TRUE;
}
/**
* This gets called when we need to make a text run for the current list of
* frames.
*/
void BuildTextRunsScanner::FlushFrames(PRBool aFlushLineBreaks, PRBool aSuppressTrailingBreak)
{
if (mMappedFlows.Length() == 0)
return;
gfxTextRun* textRun;
if (!mSkipIncompleteTextRuns && mCurrentFramesAllSameTextRun &&
((mCurrentFramesAllSameTextRun->GetFlags() & nsTextFrameUtils::TEXT_INCOMING_WHITESPACE) != 0) ==
mCurrentRunTrimLeadingWhitespace &&
IsTextRunValidForMappedFlows(mCurrentFramesAllSameTextRun)) {
// Optimization: We do not need to (re)build the textrun.
textRun = mCurrentFramesAllSameTextRun;
// Feed this run's text into the linebreaker to provide context. This also
// updates mTrimNextRunLeadingWhitespace appropriately.
SetupBreakSinksForTextRun(textRun, PR_TRUE, PR_FALSE);
mTrimNextRunLeadingWhitespace =
(textRun->GetFlags() & nsTextFrameUtils::TEXT_TRAILING_WHITESPACE) != 0;
} else {
nsAutoTArray<PRUint8,BIG_TEXT_NODE_SIZE> buffer;
if (!buffer.AppendElements(mMaxTextLength*(mDoubleByteText ? 2 : 1)))
return;
textRun = BuildTextRunForFrames(buffer.Elements());
}
if (aFlushLineBreaks) {
PRBool trailingLineBreak;
nsresult rv = mLineBreaker.Reset(&trailingLineBreak);
// textRun may be null for various reasons, including because we constructed
// a partial textrun just to get the linebreaker and other state set up
// to build the next textrun.
if (NS_SUCCEEDED(rv) && trailingLineBreak && textRun && !aSuppressTrailingBreak) {
textRun->SetFlagBits(nsTextFrameUtils::TEXT_HAS_TRAILING_BREAK);
}
PRUint32 i;
for (i = 0; i < mBreakSinks.Length(); ++i) {
if (!mBreakSinks[i]->mExistingTextRun || mBreakSinks[i]->mChangedBreaks) {
// TODO cause frames associated with the textrun to be reflowed, if they
// aren't being reflowed already!
}
}
mBreakSinks.Clear();
}
mCanStopOnThisLine = PR_TRUE;
ResetRunInfo();
}
void BuildTextRunsScanner::AccumulateRunInfo(nsTextFrame* aFrame)
{
NS_ASSERTION(mMaxTextLength <= mMaxTextLength + aFrame->GetContentLength(), "integer overflow");
mMaxTextLength += aFrame->GetContentLength();
mDoubleByteText |= aFrame->GetContent()->GetText()->Is2b();
mLastFrame = aFrame;
mCommonAncestorWithLastFrame = aFrame->GetParent();
MappedFlow* mappedFlow = &mMappedFlows[mMappedFlows.Length() - 1];
NS_ASSERTION(mappedFlow->mStartFrame == aFrame ||
mappedFlow->GetContentEnd() == aFrame->GetContentOffset(),
"Overlapping or discontiguous frames => BAD");
mappedFlow->mEndFrame = static_cast<nsTextFrame*>(aFrame->GetNextContinuation());
if (mCurrentFramesAllSameTextRun != aFrame->GetTextRun()) {
mCurrentFramesAllSameTextRun = nsnull;
}
if (mStartOfLine) {
mLineBreakBeforeFrames.AppendElement(aFrame);
mStartOfLine = PR_FALSE;
}
}
static nscoord StyleToCoord(const nsStyleCoord& aCoord)
{
if (eStyleUnit_Coord == aCoord.GetUnit()) {
return aCoord.GetCoordValue();
} else {
return 0;
}
}
static PRBool
HasTerminalNewline(const nsTextFrame* aFrame)
{
if (aFrame->GetContentLength() == 0)
return PR_FALSE;
const nsTextFragment* frag = aFrame->GetContent()->GetText();
return frag->CharAt(aFrame->GetContentEnd() - 1) == '\n';
}
PRBool
BuildTextRunsScanner::ContinueTextRunAcrossFrames(nsTextFrame* aFrame1, nsTextFrame* aFrame2)
{
if (mBidiEnabled &&
NS_GET_EMBEDDING_LEVEL(aFrame1) != NS_GET_EMBEDDING_LEVEL(aFrame2))
return PR_FALSE;
nsStyleContext* sc1 = aFrame1->GetStyleContext();
const nsStyleText* textStyle1 = sc1->GetStyleText();
// If the first frame ends in a preformatted newline, then we end the textrun
// here. This avoids creating giant textruns for an entire plain text file.
// Note that we create a single text frame for a preformatted text node,
// even if it has newlines in it, so typically we won't see trailing newlines
// until after reflow has broken up the frame into one (or more) frames per
// line. That's OK though.
if (textStyle1->WhiteSpaceIsSignificant() && HasTerminalNewline(aFrame1))
return PR_FALSE;
if (aFrame1->GetContent() == aFrame2->GetContent() &&
aFrame1->GetNextInFlow() != aFrame2) {
// aFrame2 must be a non-fluid continuation of aFrame1. This can happen
// sometimes when the unicode-bidi property is used; the bidi resolver
// breaks text into different frames even though the text has the same
// direction. We can't allow these two frames to share the same textrun
// because that would violate our invariant that two flows in the same
// textrun have different content elements.
return PR_FALSE;
}
nsStyleContext* sc2 = aFrame2->GetStyleContext();
if (sc1 == sc2)
return PR_TRUE;
const nsStyleFont* fontStyle1 = sc1->GetStyleFont();
const nsStyleFont* fontStyle2 = sc2->GetStyleFont();
const nsStyleText* textStyle2 = sc2->GetStyleText();
return fontStyle1->mFont.BaseEquals(fontStyle2->mFont) &&
sc1->GetStyleVisibility()->mLangGroup == sc2->GetStyleVisibility()->mLangGroup &&
nsLayoutUtils::GetTextRunFlagsForStyle(sc1, textStyle1, fontStyle1) ==
nsLayoutUtils::GetTextRunFlagsForStyle(sc2, textStyle2, fontStyle2);
}
void BuildTextRunsScanner::ScanFrame(nsIFrame* aFrame)
{
// First check if we can extend the current mapped frame block. This is common.
if (mMappedFlows.Length() > 0) {
MappedFlow* mappedFlow = &mMappedFlows[mMappedFlows.Length() - 1];
if (mappedFlow->mEndFrame == aFrame &&
(aFrame->GetStateBits() & NS_FRAME_IS_FLUID_CONTINUATION)) {
NS_ASSERTION(aFrame->GetType() == nsGkAtoms::textFrame,
"Flow-sibling of a text frame is not a text frame?");
// Don't do this optimization if mLastFrame has a terminal newline...
// it's quite likely preformatted and we might want to end the textrun here.
// This is almost always true:
if (mLastFrame->GetStyleContext() == aFrame->GetStyleContext() &&
!HasTerminalNewline(mLastFrame)) {
AccumulateRunInfo(static_cast<nsTextFrame*>(aFrame));
return;
}
}
}
nsIAtom* frameType = aFrame->GetType();
// Now see if we can add a new set of frames to the current textrun
if (frameType == nsGkAtoms::textFrame) {
nsTextFrame* frame = static_cast<nsTextFrame*>(aFrame);
if (mLastFrame) {
if (!ContinueTextRunAcrossFrames(mLastFrame, frame)) {
FlushFrames(PR_FALSE, PR_FALSE);
} else {
if (mLastFrame->GetContent() == frame->GetContent()) {
AccumulateRunInfo(frame);
return;
}
}
}
MappedFlow* mappedFlow = mMappedFlows.AppendElement();
if (!mappedFlow)
return;
mappedFlow->mStartFrame = frame;
mappedFlow->mAncestorControllingInitialBreak = mCommonAncestorWithLastFrame;
AccumulateRunInfo(frame);
if (mMappedFlows.Length() == 1) {
mCurrentFramesAllSameTextRun = frame->GetTextRun();
mCurrentRunTrimLeadingWhitespace = mTrimNextRunLeadingWhitespace;
}
return;
}
FrameTextTraversal traversal =
CanTextCrossFrameBoundary(aFrame, frameType);
PRBool isBR = frameType == nsGkAtoms::brFrame;
if (!traversal.mLineBreakerCanCrossFrameBoundary) {
// BR frames are special. We do not need or want to record a break opportunity
// before a BR frame.
FlushFrames(PR_TRUE, isBR);
mCommonAncestorWithLastFrame = aFrame;
mTrimNextRunLeadingWhitespace = PR_FALSE;
mStartOfLine = PR_FALSE;
} else if (!traversal.mTextRunCanCrossFrameBoundary) {
FlushFrames(PR_FALSE, PR_FALSE);
}
for (nsIFrame* f = traversal.mFrameToDescendInto; f;
f = f->GetNextSibling()) {
ScanFrame(f);
if (!traversal.mDescendIntoFrameSiblings)
break;
}
if (!traversal.mLineBreakerCanCrossFrameBoundary) {
// Really if we're a BR frame this is unnecessary since descendInto will be
// false. In fact this whole "if" statement should move into the descendInto.
FlushFrames(PR_TRUE, isBR);
mCommonAncestorWithLastFrame = aFrame;
mTrimNextRunLeadingWhitespace = PR_FALSE;
} else if (!traversal.mTextRunCanCrossFrameBoundary) {
FlushFrames(PR_FALSE, PR_FALSE);
}
LiftCommonAncestorWithLastFrameToParent(aFrame->GetParent());
}
nsTextFrame*
BuildTextRunsScanner::GetNextBreakBeforeFrame(PRUint32* aIndex)
{
PRUint32 index = *aIndex;
if (index >= mLineBreakBeforeFrames.Length())
return nsnull;
*aIndex = index + 1;
return static_cast<nsTextFrame*>(mLineBreakBeforeFrames.ElementAt(index));
}
static PRUint32
GetSpacingFlags(const nsStyleCoord& aStyleCoord)
{
nscoord spacing = StyleToCoord(aStyleCoord);
if (!spacing)
return 0;
if (spacing > 0)
return gfxTextRunFactory::TEXT_ENABLE_SPACING;
return gfxTextRunFactory::TEXT_ENABLE_SPACING |
gfxTextRunFactory::TEXT_ENABLE_NEGATIVE_SPACING;
}
static gfxFontGroup*
GetFontGroupForFrame(nsIFrame* aFrame,
nsIFontMetrics** aOutFontMetrics = nsnull)
{
if (aOutFontMetrics)
*aOutFontMetrics = nsnull;
nsCOMPtr<nsIFontMetrics> metrics;
nsLayoutUtils::GetFontMetricsForFrame(aFrame, getter_AddRefs(metrics));
if (!metrics)
return nsnull;
nsIFontMetrics* metricsRaw = metrics;
if (aOutFontMetrics) {
*aOutFontMetrics = metricsRaw;
NS_ADDREF(*aOutFontMetrics);
}
nsIThebesFontMetrics* fm = static_cast<nsIThebesFontMetrics*>(metricsRaw);
// XXX this is a bit bogus, we're releasing 'metrics' so the returned font-group
// might actually be torn down, although because of the way the device context
// caches font metrics, this seems to not actually happen. But we should fix
// this.
return fm->GetThebesFontGroup();
}
static already_AddRefed<gfxContext>
GetReferenceRenderingContext(nsTextFrame* aTextFrame, nsIRenderingContext* aRC)
{
nsCOMPtr<nsIRenderingContext> tmp = aRC;
if (!tmp) {
nsresult rv = aTextFrame->PresContext()->PresShell()->
CreateRenderingContext(aTextFrame, getter_AddRefs(tmp));
if (NS_FAILED(rv))
return nsnull;
}
gfxContext* ctx = tmp->ThebesContext();
NS_ADDREF(ctx);
return ctx;
}
/**
* The returned textrun must be released via gfxTextRunCache::ReleaseTextRun
* or gfxTextRunCache::AutoTextRun.
*/
static gfxTextRun*
GetHyphenTextRun(gfxTextRun* aTextRun, gfxContext* aContext, nsTextFrame* aTextFrame)
{
nsRefPtr<gfxContext> ctx = aContext;
if (!ctx) {
ctx = GetReferenceRenderingContext(aTextFrame, nsnull);
}
if (!ctx)
return nsnull;
gfxFontGroup* fontGroup = aTextRun->GetFontGroup();
PRUint32 flags = gfxFontGroup::TEXT_IS_PERSISTENT;
static const PRUnichar unicodeHyphen = 0x2010;
gfxTextRun* textRun =
gfxTextRunCache::MakeTextRun(&unicodeHyphen, 1, fontGroup, ctx,
aTextRun->GetAppUnitsPerDevUnit(), flags);
if (textRun && textRun->CountMissingGlyphs() == 0)
return textRun;
gfxTextRunCache::ReleaseTextRun(textRun);
static const PRUint8 dash = '-';
return gfxTextRunCache::MakeTextRun(&dash, 1, fontGroup, ctx,
aTextRun->GetAppUnitsPerDevUnit(),
flags);
}
static gfxFont::Metrics
GetFirstFontMetrics(gfxFontGroup* aFontGroup)
{
if (!aFontGroup)
return gfxFont::Metrics();
gfxFont* font = aFontGroup->GetFontAt(0);
if (!font)
return gfxFont::Metrics();
return font->GetMetrics();
}
gfxTextRun*
BuildTextRunsScanner::BuildTextRunForFrames(void* aTextBuffer)
{
gfxSkipCharsBuilder builder;
const void* textPtr = aTextBuffer;
PRBool anySmallcapsStyle = PR_FALSE;
PRBool anyTextTransformStyle = PR_FALSE;
nsIContent* lastContent = nsnull;
PRInt32 endOfLastContent = 0;
PRUint32 textFlags = nsTextFrameUtils::TEXT_NO_BREAKS;
if (mCurrentRunTrimLeadingWhitespace) {
textFlags |= nsTextFrameUtils::TEXT_INCOMING_WHITESPACE;
}
nsAutoTArray<PRInt32,50> textBreakPoints;
TextRunUserData dummyData;
TextRunMappedFlow dummyMappedFlow;
TextRunUserData* userData;
// If the situation is particularly simple (and common) we don't need to
// allocate userData.
if (mMappedFlows.Length() == 1 && !mMappedFlows[0].mEndFrame &&
mMappedFlows[0].mStartFrame->GetContentOffset() == 0) {
userData = &dummyData;
dummyData.mMappedFlows = &dummyMappedFlow;
} else {
userData = static_cast<TextRunUserData*>
(nsMemory::Alloc(sizeof(TextRunUserData) + mMappedFlows.Length()*sizeof(TextRunMappedFlow)));
userData->mMappedFlows = reinterpret_cast<TextRunMappedFlow*>(userData + 1);
}
userData->mMappedFlowCount = mMappedFlows.Length();
userData->mLastFlowIndex = 0;
PRUint32 currentTransformedTextOffset = 0;
PRUint32 nextBreakIndex = 0;
nsTextFrame* nextBreakBeforeFrame = GetNextBreakBeforeFrame(&nextBreakIndex);
PRUint32 i;
const nsStyleText* textStyle = nsnull;
const nsStyleFont* fontStyle = nsnull;
nsStyleContext* lastStyleContext = nsnull;
for (i = 0; i < mMappedFlows.Length(); ++i) {
MappedFlow* mappedFlow = &mMappedFlows[i];
nsTextFrame* f = mappedFlow->mStartFrame;
lastStyleContext = f->GetStyleContext();
// Detect use of text-transform or font-variant anywhere in the run
textStyle = f->GetStyleText();
if (NS_STYLE_TEXT_TRANSFORM_NONE != textStyle->mTextTransform) {
anyTextTransformStyle = PR_TRUE;
}
textFlags |= GetSpacingFlags(textStyle->mLetterSpacing);
textFlags |= GetSpacingFlags(textStyle->mWordSpacing);
PRBool compressWhitespace = !textStyle->WhiteSpaceIsSignificant();
if (NS_STYLE_TEXT_ALIGN_JUSTIFY == textStyle->mTextAlign && compressWhitespace) {
textFlags |= gfxTextRunFactory::TEXT_ENABLE_SPACING;
}
fontStyle = f->GetStyleFont();
if (NS_STYLE_FONT_VARIANT_SMALL_CAPS == fontStyle->mFont.variant) {
anySmallcapsStyle = PR_TRUE;
}
// Figure out what content is included in this flow.
nsIContent* content = f->GetContent();
const nsTextFragment* frag = content->GetText();
PRInt32 contentStart = mappedFlow->mStartFrame->GetContentOffset();
PRInt32 contentEnd = mappedFlow->GetContentEnd();
PRInt32 contentLength = contentEnd - contentStart;
TextRunMappedFlow* newFlow = &userData->mMappedFlows[i];
newFlow->mStartFrame = mappedFlow->mStartFrame;
newFlow->mDOMOffsetToBeforeTransformOffset = builder.GetCharCount() -
mappedFlow->mStartFrame->GetContentOffset();
newFlow->mContentLength = contentLength;
while (nextBreakBeforeFrame && nextBreakBeforeFrame->GetContent() == content) {
textBreakPoints.AppendElement(
nextBreakBeforeFrame->GetContentOffset() + newFlow->mDOMOffsetToBeforeTransformOffset);
nextBreakBeforeFrame = GetNextBreakBeforeFrame(&nextBreakIndex);
}
PRUint32 analysisFlags;
if (frag->Is2b()) {
NS_ASSERTION(mDoubleByteText, "Wrong buffer char size!");
PRUnichar* bufStart = static_cast<PRUnichar*>(aTextBuffer);
PRUnichar* bufEnd = nsTextFrameUtils::TransformText(
frag->Get2b() + contentStart, contentLength, bufStart,
compressWhitespace, &mTrimNextRunLeadingWhitespace, &builder, &analysisFlags);
aTextBuffer = bufEnd;
} else {
if (mDoubleByteText) {
// Need to expand the text. First transform it into a temporary buffer,
// then expand.
nsAutoTArray<PRUint8,BIG_TEXT_NODE_SIZE> tempBuf;
if (!tempBuf.AppendElements(contentLength)) {
DestroyUserData(userData);
return nsnull;
}
PRUint8* bufStart = tempBuf.Elements();
PRUint8* end = nsTextFrameUtils::TransformText(
reinterpret_cast<const PRUint8*>(frag->Get1b()) + contentStart, contentLength,
bufStart, compressWhitespace, &mTrimNextRunLeadingWhitespace,
&builder, &analysisFlags);
aTextBuffer = ExpandBuffer(static_cast<PRUnichar*>(aTextBuffer),
tempBuf.Elements(), end - tempBuf.Elements());
} else {
PRUint8* bufStart = static_cast<PRUint8*>(aTextBuffer);
PRUint8* end = nsTextFrameUtils::TransformText(
reinterpret_cast<const PRUint8*>(frag->Get1b()) + contentStart, contentLength,
bufStart,
compressWhitespace, &mTrimNextRunLeadingWhitespace, &builder, &analysisFlags);
aTextBuffer = end;
}
}
// In CSS 2.1, we do not compress a space that is preceded by a non-compressible
// space.
if (!compressWhitespace) {
mTrimNextRunLeadingWhitespace = PR_FALSE;
}
textFlags |= analysisFlags;
currentTransformedTextOffset =
(static_cast<const PRUint8*>(aTextBuffer) - static_cast<const PRUint8*>(textPtr)) >> mDoubleByteText;
lastContent = content;
endOfLastContent = contentEnd;
}
// Check for out-of-memory in gfxSkipCharsBuilder
if (!builder.IsOK()) {
DestroyUserData(userData);
return nsnull;
}
void* finalUserData;
if (userData == &dummyData) {
textFlags |= nsTextFrameUtils::TEXT_IS_SIMPLE_FLOW;
userData = nsnull;
finalUserData = mMappedFlows[0].mStartFrame;
} else {
finalUserData = userData;
}
PRUint32 transformedLength = currentTransformedTextOffset;
// Disable this because it breaks the word cache. Disable at least until
// we have a CharacterDataWillChange notification.
//
// if (!(textFlags & nsTextFrameUtils::TEXT_WAS_TRANSFORMED) &&
// mMappedFlows.Length() == 1) {
// // The textrun maps one continuous, unmodified run of DOM text. It can
// // point to the DOM text directly.
// const nsTextFragment* frag = lastContent->GetText();
// if (frag->Is2b()) {
// textPtr = frag->Get2b() + mMappedFlows[0].mContentOffset;
// } else {
// textPtr = frag->Get1b() + mMappedFlows[0].mContentOffset;
// }
// textFlags |= gfxTextRunFactory::TEXT_IS_PERSISTENT;
// }
//
// Now build the textrun
nsTextFrame* firstFrame = mMappedFlows[0].mStartFrame;
gfxFontGroup* fontGroup = GetFontGroupForFrame(firstFrame);
if (!fontGroup) {
DestroyUserData(userData);
return nsnull;
}
if (textFlags & nsTextFrameUtils::TEXT_HAS_TAB) {
textFlags |= gfxTextRunFactory::TEXT_ENABLE_SPACING;
}
if (textFlags & nsTextFrameUtils::TEXT_HAS_SHY) {
textFlags |= gfxTextRunFactory::TEXT_ENABLE_HYPHEN_BREAKS;
}
if (mBidiEnabled && (NS_GET_EMBEDDING_LEVEL(firstFrame) & 1)) {
textFlags |= gfxTextRunFactory::TEXT_IS_RTL;
}
if (mTrimNextRunLeadingWhitespace) {
textFlags |= nsTextFrameUtils::TEXT_TRAILING_WHITESPACE;
}
// ContinueTextRunAcrossFrames guarantees that it doesn't matter which
// frame's style is used, so use the last frame's
textFlags |= nsLayoutUtils::GetTextRunFlagsForStyle(lastStyleContext,
textStyle, fontStyle);
// XXX this is a bit of a hack. For performance reasons, if we're favouring
// performance over quality, don't try to get accurate glyph extents.
if (!(textFlags & gfxTextRunFactory::TEXT_OPTIMIZE_SPEED)) {
textFlags |= gfxTextRunFactory::TEXT_NEED_BOUNDING_BOX;
}
gfxSkipChars skipChars;
skipChars.TakeFrom(&builder);
// Convert linebreak coordinates to transformed string offsets
NS_ASSERTION(nextBreakIndex == mLineBreakBeforeFrames.Length(),
"Didn't find all the frames to break-before...");
gfxSkipCharsIterator iter(skipChars);
nsAutoTArray<PRUint32,50> textBreakPointsAfterTransform;
for (i = 0; i < textBreakPoints.Length(); ++i) {
nsTextFrameUtils::AppendLineBreakOffset(&textBreakPointsAfterTransform,
iter.ConvertOriginalToSkipped(textBreakPoints[i]));
}
if (mStartOfLine) {
nsTextFrameUtils::AppendLineBreakOffset(&textBreakPointsAfterTransform,
transformedLength);
}
// Setup factory chain
nsAutoPtr<nsTransformingTextRunFactory> transformingFactory;
if (anySmallcapsStyle) {
transformingFactory = new nsFontVariantTextRunFactory();
}
if (anyTextTransformStyle) {
transformingFactory =
new nsCaseTransformTextRunFactory(transformingFactory.forget());
}
nsTArray<nsStyleContext*> styles;
if (transformingFactory) {
iter.SetOriginalOffset(0);
for (i = 0; i < mMappedFlows.Length(); ++i) {
MappedFlow* mappedFlow = &mMappedFlows[i];
nsTextFrame* f;
for (f = mappedFlow->mStartFrame; f != mappedFlow->mEndFrame;
f = static_cast<nsTextFrame*>(f->GetNextContinuation())) {
PRUint32 offset = iter.GetSkippedOffset();
iter.AdvanceOriginal(f->GetContentLength());
PRUint32 end = iter.GetSkippedOffset();
nsStyleContext* sc = f->GetStyleContext();
PRUint32 j;
for (j = offset; j < end; ++j) {
styles.AppendElement(sc);
}
}
}
textFlags |= nsTextFrameUtils::TEXT_IS_TRANSFORMED;
NS_ASSERTION(iter.GetSkippedOffset() == transformedLength,
"We didn't cover all the characters in the text run!");
}
gfxTextRun* textRun;
gfxTextRunFactory::Parameters params =
{ mContext, finalUserData, &skipChars,
textBreakPointsAfterTransform.Elements(), textBreakPointsAfterTransform.Length(),
firstFrame->PresContext()->AppUnitsPerDevPixel() };
if (mDoubleByteText) {
const PRUnichar* text = static_cast<const PRUnichar*>(textPtr);
if (transformingFactory) {
textRun = transformingFactory->MakeTextRun(text, transformedLength, &params,
fontGroup, textFlags, styles.Elements());
if (textRun) {
// ownership of the factory has passed to the textrun
transformingFactory.forget();
}
} else {
textRun = MakeTextRun(text, transformedLength, fontGroup, &params, textFlags);
}
} else {
const PRUint8* text = static_cast<const PRUint8*>(textPtr);
textFlags |= gfxFontGroup::TEXT_IS_8BIT;
if (transformingFactory) {
textRun = transformingFactory->MakeTextRun(text, transformedLength, &params,
fontGroup, textFlags, styles.Elements());
if (textRun) {
// ownership of the factory has passed to the textrun
transformingFactory.forget();
}
} else {
textRun = MakeTextRun(text, transformedLength, fontGroup, &params, textFlags);
}
}
if (!textRun) {
DestroyUserData(userData);
return nsnull;
}
// We have to set these up after we've created the textrun, because
// the breaks may be stored in the textrun during this very call.
// This is a bit annoying because it requires another loop over the frames
// making up the textrun, but I don't see a way to avoid this.
SetupBreakSinksForTextRun(textRun, PR_FALSE, mSkipIncompleteTextRuns);
if (mSkipIncompleteTextRuns) {
mSkipIncompleteTextRuns = !TextContainsLineBreakerWhiteSpace(textPtr,
transformedLength, mDoubleByteText);
// Nuke the textrun
gTextRuns->RemoveFromCache(textRun);
delete textRun;
DestroyUserData(userData);
return nsnull;
}
// Actually wipe out the textruns associated with the mapped frames and associate
// those frames with this text run.
AssignTextRun(textRun);
return textRun;
}
static PRBool
HasCompressedLeadingWhitespace(nsTextFrame* aFrame, PRInt32 aContentEndOffset,
const gfxSkipCharsIterator& aIterator)
{
if (!aIterator.IsOriginalCharSkipped())
return PR_FALSE;
gfxSkipCharsIterator iter = aIterator;
PRInt32 frameContentOffset = aFrame->GetContentOffset();
const nsTextFragment* frag = aFrame->GetContent()->GetText();
while (frameContentOffset < aContentEndOffset && iter.IsOriginalCharSkipped()) {
if (IsTrimmableSpace(frag, frameContentOffset))
return PR_TRUE;
++frameContentOffset;
iter.AdvanceOriginal(1);
}
return PR_FALSE;
}
void
BuildTextRunsScanner::SetupBreakSinksForTextRun(gfxTextRun* aTextRun,
PRBool aIsExistingTextRun,
PRBool aSuppressSink)
{
// textruns have uniform language
nsIAtom* lang = mMappedFlows[0].mStartFrame->GetStyleVisibility()->mLangGroup;
// We keep this pointed at the skip-chars data for the current mappedFlow.
// This lets us cheaply check whether the flow has compressed initial
// whitespace...
gfxSkipCharsIterator iter(aTextRun->GetSkipChars());
PRUint32 i;
for (i = 0; i < mMappedFlows.Length(); ++i) {
MappedFlow* mappedFlow = &mMappedFlows[i];
PRUint32 offset = iter.GetSkippedOffset();
gfxSkipCharsIterator iterNext = iter;
iterNext.AdvanceOriginal(mappedFlow->GetContentEnd() -
mappedFlow->mStartFrame->GetContentOffset());
nsAutoPtr<BreakSink>* breakSink = mBreakSinks.AppendElement(
new BreakSink(aTextRun, mContext, offset, aIsExistingTextRun));
if (!breakSink || !*breakSink)
return;
PRUint32 length = iterNext.GetSkippedOffset() - offset;
PRUint32 flags = 0;
nsIFrame* initialBreakController = mappedFlow->mAncestorControllingInitialBreak;
if (!initialBreakController) {
initialBreakController = mLineContainer;
}
if (!initialBreakController->GetStyleText()->WhiteSpaceCanWrap()) {
flags |= nsLineBreaker::BREAK_SUPPRESS_INITIAL;
}
nsTextFrame* startFrame = mappedFlow->mStartFrame;
const nsStyleText* textStyle = startFrame->GetStyleText();
if (!textStyle->WhiteSpaceCanWrap()) {
flags |= nsLineBreaker::BREAK_SUPPRESS_INSIDE;
}
if (aTextRun->GetFlags() & nsTextFrameUtils::TEXT_NO_BREAKS) {
flags |= nsLineBreaker::BREAK_SKIP_SETTING_NO_BREAKS;
}
if (textStyle->mTextTransform == NS_STYLE_TEXT_TRANSFORM_CAPITALIZE) {
flags |= nsLineBreaker::BREAK_NEED_CAPITALIZATION;
}
if (HasCompressedLeadingWhitespace(startFrame, mappedFlow->GetContentEnd(), iter)) {
mLineBreaker.AppendInvisibleWhitespace(flags);
}
if (length > 0) {
BreakSink* sink = aSuppressSink ? nsnull : (*breakSink).get();
if (aTextRun->GetFlags() & gfxFontGroup::TEXT_IS_8BIT) {
mLineBreaker.AppendText(lang, aTextRun->GetText8Bit() + offset,
length, flags, sink);
} else {
mLineBreaker.AppendText(lang, aTextRun->GetTextUnicode() + offset,
length, flags, sink);
}
}
iter = iterNext;
}
}
void
BuildTextRunsScanner::AssignTextRun(gfxTextRun* aTextRun)
{
nsIContent* lastContent = nsnull;
PRUint32 i;
for (i = 0; i < mMappedFlows.Length(); ++i) {
MappedFlow* mappedFlow = &mMappedFlows[i];
nsTextFrame* startFrame = mappedFlow->mStartFrame;
nsTextFrame* endFrame = mappedFlow->mEndFrame;
nsTextFrame* f;
for (f = startFrame; f != endFrame;
f = static_cast<nsTextFrame*>(f->GetNextContinuation())) {
#ifdef DEBUG_roc
if (f->GetTextRun()) {
gfxTextRun* textRun = f->GetTextRun();
if (textRun->GetFlags() & nsTextFrameUtils::TEXT_IS_SIMPLE_FLOW) {
if (mMappedFlows[0].mStartFrame != static_cast<nsTextFrame*>(textRun->GetUserData())) {
NS_WARNING("REASSIGNING SIMPLE FLOW TEXT RUN!");
}
} else {
TextRunUserData* userData =
static_cast<TextRunUserData*>(textRun->GetUserData());
if (PRUint32(userData->mMappedFlowCount) >= mMappedFlows.Length() ||
userData->mMappedFlows[userData->mMappedFlowCount - 1].mStartFrame !=
mMappedFlows[userData->mMappedFlowCount - 1].mStartFrame) {
NS_WARNING("REASSIGNING MULTIFLOW TEXT RUN (not append)!");
}
}
}
#endif
f->ClearTextRun();
f->SetTextRun(aTextRun);
}
// BuildTextRunForFrames mashes together mapped flows for the same element,
// so we do that here too.
lastContent = startFrame->GetContent();
}
}
gfxSkipCharsIterator
nsTextFrame::EnsureTextRun(gfxContext* aReferenceContext, nsIFrame* aLineContainer,
const nsLineList::iterator* aLine,
PRUint32* aFlowEndInTextRun)
{
if (mTextRun && (!aLine || !(*aLine)->GetInvalidateTextRuns())) {
if (mTextRun->GetExpirationState()->IsTracked()) {
gTextRuns->MarkUsed(mTextRun);
}
} else {
nsRefPtr<gfxContext> ctx = aReferenceContext;
if (!ctx) {
ctx = GetReferenceRenderingContext(this, nsnull);
}
if (ctx) {
BuildTextRuns(ctx, this, aLineContainer, aLine);
}
if (!mTextRun) {
// A text run was not constructed for this frame. This is bad. The caller
// will check mTextRun.
static const gfxSkipChars emptySkipChars;
return gfxSkipCharsIterator(emptySkipChars, 0);
}
}
if (mTextRun->GetFlags() & nsTextFrameUtils::TEXT_IS_SIMPLE_FLOW) {
if (aFlowEndInTextRun) {
*aFlowEndInTextRun = mTextRun->GetLength();
}
return gfxSkipCharsIterator(mTextRun->GetSkipChars(), 0, mContentOffset);
}
TextRunUserData* userData = static_cast<TextRunUserData*>(mTextRun->GetUserData());
// Find the flow that contains us
PRInt32 direction;
PRInt32 startAt = userData->mLastFlowIndex;
// Search first forward and then backward from the current position
for (direction = 1; direction >= -1; direction -= 2) {
PRInt32 i;
for (i = startAt; 0 <= i && i < userData->mMappedFlowCount; i += direction) {
TextRunMappedFlow* flow = &userData->mMappedFlows[i];
if (flow->mStartFrame->GetContent() == mContent) {
// Since textruns can only contain one flow for a given content element,
// this must be our flow.
userData->mLastFlowIndex = i;
gfxSkipCharsIterator iter(mTextRun->GetSkipChars(),
flow->mDOMOffsetToBeforeTransformOffset, mContentOffset);
if (aFlowEndInTextRun) {
if (i + 1 < userData->mMappedFlowCount) {
gfxSkipCharsIterator end(mTextRun->GetSkipChars());
*aFlowEndInTextRun = end.ConvertOriginalToSkipped(
flow[1].mStartFrame->GetContentOffset() + flow[1].mDOMOffsetToBeforeTransformOffset);
} else {
*aFlowEndInTextRun = mTextRun->GetLength();
}
}
return iter;
}
++flow;
}
startAt = userData->mLastFlowIndex - 1;
}
NS_ERROR("Can't find flow containing this frame???");
static const gfxSkipChars emptySkipChars;
return gfxSkipCharsIterator(emptySkipChars, 0);
}
static PRUint32
GetEndOfTrimmedText(const nsTextFragment* aFrag,
PRUint32 aStart, PRUint32 aEnd,
gfxSkipCharsIterator* aIterator)
{
aIterator->SetSkippedOffset(aEnd);
while (aIterator->GetSkippedOffset() > aStart) {
aIterator->AdvanceSkipped(-1);
if (!IsTrimmableSpace(aFrag, aIterator->GetOriginalOffset()))
return aIterator->GetSkippedOffset() + 1;
}
return aStart;
}
nsTextFrame::TrimmedOffsets
nsTextFrame::GetTrimmedOffsets(const nsTextFragment* aFrag,
PRBool aTrimAfter)
{
NS_ASSERTION(mTextRun, "Need textrun here");
TrimmedOffsets offsets = { GetContentOffset(), GetContentLength() };
const nsStyleText* textStyle = GetStyleText();
if (textStyle->WhiteSpaceIsSignificant())
return offsets;
if (GetStateBits() & TEXT_START_OF_LINE) {
PRInt32 whitespaceCount =
GetTrimmableWhitespaceCount(aFrag, offsets.mStart, offsets.mLength, 1);
offsets.mStart += whitespaceCount;
offsets.mLength -= whitespaceCount;
}
if (aTrimAfter && (GetStateBits() & TEXT_END_OF_LINE)) {
PRInt32 whitespaceCount =
GetTrimmableWhitespaceCount(aFrag, offsets.GetEnd() - 1,
offsets.mLength, -1);
offsets.mLength -= whitespaceCount;
}
return offsets;
}
/*
* Currently only Unicode characters below 0x10000 have their spacing modified
* by justification. If characters above 0x10000 turn out to need
* justification spacing, that will require extra work. Currently,
* this function must not include 0xd800 to 0xdbff because these characters
* are surrogates.
*/
static PRBool IsJustifiableCharacter(const nsTextFragment* aFrag, PRInt32 aPos,
PRBool aLangIsCJ)
{
PRUnichar ch = aFrag->CharAt(aPos);
if (ch == '\n' || ch == '\t')
return PR_TRUE;
if (ch == ' ') {
// Don't justify spaces that are combined with diacriticals
if (!aFrag->Is2b())
return PR_TRUE;
return !nsTextFrameUtils::IsSpaceCombiningSequenceTail(
aFrag->Get2b() + aPos + 1, aFrag->GetLength() - (aPos + 1));
}
if (ch < 0x2150u)
return PR_FALSE;
if (aLangIsCJ && (
(0x2150u <= ch && ch <= 0x22ffu) || // Number Forms, Arrows, Mathematical Operators
(0x2460u <= ch && ch <= 0x24ffu) || // Enclosed Alphanumerics
(0x2580u <= ch && ch <= 0x27bfu) || // Block Elements, Geometric Shapes, Miscellaneous Symbols, Dingbats
(0x27f0u <= ch && ch <= 0x2bffu) || // Supplemental Arrows-A, Braille Patterns, Supplemental Arrows-B,
// Miscellaneous Mathematical Symbols-B, Supplemental Mathematical Operators,
// Miscellaneous Symbols and Arrows
(0x2e80u <= ch && ch <= 0x312fu) || // CJK Radicals Supplement, CJK Radicals Supplement,
// Ideographic Description Characters, CJK Symbols and Punctuation,
// Hiragana, Katakana, Bopomofo
(0x3190u <= ch && ch <= 0xabffu) || // Kanbun, Bopomofo Extended, Katakana Phonetic Extensions,
// Enclosed CJK Letters and Months, CJK Compatibility,
// CJK Unified Ideographs Extension A, Yijing Hexagram Symbols,
// CJK Unified Ideographs, Yi Syllables, Yi Radicals
(0xf900u <= ch && ch <= 0xfaffu) || // CJK Compatibility Ideographs
(0xff5eu <= ch && ch <= 0xff9fu) // Halfwidth and Fullwidth Forms(a part)
))
return PR_TRUE;
return PR_FALSE;
}
static void ClearMetrics(nsHTMLReflowMetrics& aMetrics)
{
aMetrics.width = 0;
aMetrics.height = 0;
aMetrics.ascent = 0;
}
static PRInt32 FindChar(const nsTextFragment* frag,
PRInt32 aOffset, PRInt32 aLength, PRUnichar ch)
{
PRInt32 i = 0;
if (frag->Is2b()) {
const PRUnichar* str = frag->Get2b() + aOffset;
for (; i < aLength; ++i) {
if (*str == ch)
return i + aOffset;
++str;
}
} else {
if (PRUint16(ch) <= 0xFF) {
const char* str = frag->Get1b() + aOffset;
const void* p = memchr(str, ch, aLength);
if (p)
return (static_cast<const char*>(p) - str) + aOffset;
}
}
return -1;
}
static PRBool IsChineseJapaneseLangGroup(nsIFrame* aFrame)
{
nsIAtom* langGroup = aFrame->GetStyleVisibility()->mLangGroup;
return langGroup == nsGkAtoms::Japanese
|| langGroup == nsGkAtoms::Chinese
|| langGroup == nsGkAtoms::Taiwanese
|| langGroup == nsGkAtoms::HongKongChinese;
}
#ifdef DEBUG
static PRBool IsInBounds(const gfxSkipCharsIterator& aStart, PRInt32 aContentLength,
PRUint32 aOffset, PRUint32 aLength) {
if (aStart.GetSkippedOffset() > aOffset)
return PR_FALSE;
if (aContentLength == PR_INT32_MAX)
return PR_TRUE;
gfxSkipCharsIterator iter(aStart);
iter.AdvanceOriginal(aContentLength);
return iter.GetSkippedOffset() >= aOffset + aLength;
}
#endif
class NS_STACK_CLASS PropertyProvider : public gfxTextRun::PropertyProvider {
public:
/**
* Use this constructor for reflow, when we don't know what text is
* really mapped by the frame and we have a lot of other data around.
*
* @param aLength can be PR_INT32_MAX to indicate we cover all the text
* associated with aFrame up to where its flow chain ends in the given
* textrun. If PR_INT32_MAX is passed, justification and hyphen-related methods
* cannot be called, nor can GetOriginalLength().
*/
PropertyProvider(gfxTextRun* aTextRun, const nsStyleText* aTextStyle,
const nsTextFragment* aFrag, nsTextFrame* aFrame,
const gfxSkipCharsIterator& aStart, PRInt32 aLength,
nsIFrame* aLineContainer,
nscoord aOffsetFromBlockOriginForTabs)
: mTextRun(aTextRun), mFontGroup(nsnull),
mTextStyle(aTextStyle), mFrag(aFrag),
mLineContainer(aLineContainer),
mFrame(aFrame), mStart(aStart), mTempIterator(aStart),
mTabWidths(nsnull), mLength(aLength),
mWordSpacing(StyleToCoord(mTextStyle->mWordSpacing)),
mLetterSpacing(StyleToCoord(mTextStyle->mLetterSpacing)),
mJustificationSpacing(0),
mHyphenWidth(-1),
mOffsetFromBlockOriginForTabs(aOffsetFromBlockOriginForTabs),
mReflowing(PR_TRUE)
{
NS_ASSERTION(mStart.IsInitialized(), "Start not initialized?");
}
/**
* Use this constructor after the frame has been reflowed and we don't
* have other data around. Gets everything from the frame. EnsureTextRun
* *must* be called before this!!!
*/
PropertyProvider(nsTextFrame* aFrame, const gfxSkipCharsIterator& aStart)
: mTextRun(aFrame->GetTextRun()), mFontGroup(nsnull),
mTextStyle(aFrame->GetStyleText()),
mFrag(aFrame->GetContent()->GetText()),
mLineContainer(nsnull),
mFrame(aFrame), mStart(aStart), mTempIterator(aStart),
mTabWidths(nsnull),
mLength(aFrame->GetContentLength()),
mWordSpacing(StyleToCoord(mTextStyle->mWordSpacing)),
mLetterSpacing(StyleToCoord(mTextStyle->mLetterSpacing)),
mJustificationSpacing(0),
mHyphenWidth(-1),
mOffsetFromBlockOriginForTabs(0),
mReflowing(PR_FALSE)
{
NS_ASSERTION(mTextRun, "Textrun not initialized!");
}
// Call this after construction if you're not going to reflow the text
void InitializeForDisplay(PRBool aTrimAfter);
virtual void GetSpacing(PRUint32 aStart, PRUint32 aLength, Spacing* aSpacing);
virtual gfxFloat GetHyphenWidth();
virtual void GetHyphenationBreaks(PRUint32 aStart, PRUint32 aLength,
PRPackedBool* aBreakBefore);
void GetSpacingInternal(PRUint32 aStart, PRUint32 aLength, Spacing* aSpacing,
PRBool aIgnoreTabs);
/**
* Count the number of justifiable characters in the given DOM range
*/
PRUint32 ComputeJustifiableCharacters(PRInt32 aOffset, PRInt32 aLength);
/**
* Find the start and end of the justifiable characters. Does not depend on the
* position of aStart or aEnd, although it's most efficient if they are near the
* start and end of the text frame.
*/
void FindJustificationRange(gfxSkipCharsIterator* aStart,
gfxSkipCharsIterator* aEnd);
const nsStyleText* GetStyleText() { return mTextStyle; }
nsTextFrame* GetFrame() { return mFrame; }
// This may not be equal to the frame offset/length in because we may have
// adjusted for whitespace trimming according to the state bits set in the frame
// (for the static provider)
const gfxSkipCharsIterator& GetStart() { return mStart; }
// May return PR_INT32_MAX if that was given to the constructor
PRUint32 GetOriginalLength() {
NS_ASSERTION(mLength != PR_INT32_MAX, "Length not known");
return mLength;
}
const nsTextFragment* GetFragment() { return mFrag; }
gfxFontGroup* GetFontGroup() {
if (!mFontGroup)
InitFontGroupAndFontMetrics();
return mFontGroup;
}
nsIFontMetrics* GetFontMetrics() {
if (!mFontMetrics)
InitFontGroupAndFontMetrics();
return mFontMetrics;
}
gfxFloat* GetTabWidths(PRUint32 aTransformedStart, PRUint32 aTransformedLength);
const gfxSkipCharsIterator& GetEndHint() { return mTempIterator; }
protected:
void SetupJustificationSpacing();
void InitFontGroupAndFontMetrics() {
mFontGroup = GetFontGroupForFrame(mFrame, getter_AddRefs(mFontMetrics));
}
gfxTextRun* mTextRun;
gfxFontGroup* mFontGroup;
nsCOMPtr<nsIFontMetrics> mFontMetrics;
const nsStyleText* mTextStyle;
const nsTextFragment* mFrag;
nsIFrame* mLineContainer;
nsTextFrame* mFrame;
gfxSkipCharsIterator mStart; // Offset in original and transformed string
gfxSkipCharsIterator mTempIterator;
// Widths for each transformed string character, 0 for non-tab characters.
// Either null, or pointing to the frame's tabWidthProperty.
nsTArray<gfxFloat>* mTabWidths;
PRInt32 mLength; // DOM string length, may be PR_INT32_MAX
gfxFloat mWordSpacing; // space for each whitespace char
gfxFloat mLetterSpacing; // space for each letter
gfxFloat mJustificationSpacing;
gfxFloat mHyphenWidth;
gfxFloat mOffsetFromBlockOriginForTabs;
PRPackedBool mReflowing;
};
PRUint32
PropertyProvider::ComputeJustifiableCharacters(PRInt32 aOffset, PRInt32 aLength)
{
// Scan non-skipped characters and count justifiable chars.
nsSkipCharsRunIterator
run(mStart, nsSkipCharsRunIterator::LENGTH_INCLUDES_SKIPPED, aLength);
run.SetOriginalOffset(aOffset);
PRUint32 justifiableChars = 0;
PRBool isCJK = IsChineseJapaneseLangGroup(mFrame);
while (run.NextRun()) {
PRInt32 i;
for (i = 0; i < run.GetRunLength(); ++i) {
justifiableChars +=
IsJustifiableCharacter(mFrag, run.GetOriginalOffset() + i, isCJK);
}
}
return justifiableChars;
}
/**
* Finds the offset of the first character of the cluster containing aPos
*/
static void FindClusterStart(gfxTextRun* aTextRun,
gfxSkipCharsIterator* aPos)
{
while (aPos->GetOriginalOffset() > 0) {
if (aPos->IsOriginalCharSkipped() ||
aTextRun->IsClusterStart(aPos->GetSkippedOffset())) {
break;
}
aPos->AdvanceOriginal(-1);
}
}
/**
* Finds the offset of the last character of the cluster containing aPos
*/
static void FindClusterEnd(gfxTextRun* aTextRun, PRInt32 aOriginalEnd,
gfxSkipCharsIterator* aPos)
{
NS_PRECONDITION(aPos->GetOriginalOffset() < aOriginalEnd,
"character outside string");
aPos->AdvanceOriginal(1);
while (aPos->GetOriginalOffset() < aOriginalEnd) {
if (aPos->IsOriginalCharSkipped() ||
aTextRun->IsClusterStart(aPos->GetSkippedOffset())) {
break;
}
aPos->AdvanceOriginal(1);
}
aPos->AdvanceOriginal(-1);
}
// aStart, aLength in transformed string offsets
void
PropertyProvider::GetSpacing(PRUint32 aStart, PRUint32 aLength,
Spacing* aSpacing)
{
GetSpacingInternal(aStart, aLength, aSpacing,
(mTextRun->GetFlags() & nsTextFrameUtils::TEXT_HAS_TAB) == 0);
}
static PRBool
CanAddSpacingAfter(gfxTextRun* aTextRun, PRUint32 aOffset)
{
if (aOffset + 1 >= aTextRun->GetLength())
return PR_TRUE;
return aTextRun->IsClusterStart(aOffset + 1) &&
aTextRun->IsLigatureGroupStart(aOffset + 1);
}
void
PropertyProvider::GetSpacingInternal(PRUint32 aStart, PRUint32 aLength,
Spacing* aSpacing, PRBool aIgnoreTabs)
{
NS_PRECONDITION(IsInBounds(mStart, mLength, aStart, aLength), "Range out of bounds");
PRUint32 index;
for (index = 0; index < aLength; ++index) {
aSpacing[index].mBefore = 0.0;
aSpacing[index].mAfter = 0.0;
}
// Find our offset into the original+transformed string
gfxSkipCharsIterator start(mStart);
start.SetSkippedOffset(aStart);
// First, compute the word and letter spacing
if (mWordSpacing || mLetterSpacing) {
// Iterate over non-skipped characters
nsSkipCharsRunIterator
run(start, nsSkipCharsRunIterator::LENGTH_UNSKIPPED_ONLY, aLength);
while (run.NextRun()) {
PRUint32 runOffsetInSubstring = run.GetSkippedOffset() - aStart;
PRInt32 i;
gfxSkipCharsIterator iter = run.GetPos();
for (i = 0; i < run.GetRunLength(); ++i) {
if (CanAddSpacingAfter(mTextRun, run.GetSkippedOffset() + i)) {
// End of a cluster, not in a ligature: put letter-spacing after it
aSpacing[runOffsetInSubstring + i].mAfter += mLetterSpacing;
}
if (IsCSSWordSpacingSpace(mFrag, i + run.GetOriginalOffset())) {
// It kinda sucks, but space characters can be part of clusters,
// and even still be whitespace (I think!)
iter.SetSkippedOffset(run.GetSkippedOffset() + i);
FindClusterEnd(mTextRun, run.GetOriginalOffset() + run.GetRunLength(),
&iter);
aSpacing[iter.GetSkippedOffset() - aStart].mAfter += mWordSpacing;
}
}
}
}
// Now add tab spacing, if there is any
if (!aIgnoreTabs) {
gfxFloat* tabs = GetTabWidths(aStart, aLength);
if (tabs) {
for (index = 0; index < aLength; ++index) {
aSpacing[index].mAfter += tabs[index];
}
}
}
// Now add in justification spacing
if (mJustificationSpacing) {
gfxFloat halfJustificationSpace = mJustificationSpacing/2;
// Scan non-skipped characters and adjust justifiable chars, adding
// justification space on either side of the cluster
PRBool isCJK = IsChineseJapaneseLangGroup(mFrame);
gfxSkipCharsIterator justificationStart(mStart), justificationEnd(mStart);
FindJustificationRange(&justificationStart, &justificationEnd);
nsSkipCharsRunIterator
run(start, nsSkipCharsRunIterator::LENGTH_UNSKIPPED_ONLY, aLength);
while (run.NextRun()) {
PRInt32 i;
gfxSkipCharsIterator iter = run.GetPos();
for (i = 0; i < run.GetRunLength(); ++i) {
PRInt32 originalOffset = run.GetOriginalOffset() + i;
if (IsJustifiableCharacter(mFrag, originalOffset, isCJK)) {
iter.SetOriginalOffset(originalOffset);
FindClusterStart(mTextRun, &iter);
PRUint32 clusterFirstChar = iter.GetSkippedOffset();
FindClusterEnd(mTextRun, run.GetOriginalOffset() + run.GetRunLength(), &iter);
PRUint32 clusterLastChar = iter.GetSkippedOffset();
// Only apply justification to characters before justificationEnd
if (clusterFirstChar >= justificationStart.GetSkippedOffset() &&
clusterLastChar < justificationEnd.GetSkippedOffset()) {
aSpacing[clusterFirstChar - aStart].mBefore += halfJustificationSpace;
aSpacing[clusterLastChar - aStart].mAfter += halfJustificationSpace;
}
}
}
}
}
}
static void TabWidthDestructor(void* aObject, nsIAtom* aProp, void* aValue,
void* aData)
{
delete static_cast<nsTArray<gfxFloat>*>(aValue);
}
gfxFloat*
PropertyProvider::GetTabWidths(PRUint32 aStart, PRUint32 aLength)
{
if (!mTabWidths) {
if (!mReflowing) {
mTabWidths = static_cast<nsTArray<gfxFloat>*>
(mFrame->GetProperty(nsGkAtoms::tabWidthProperty));
if (!mTabWidths) {
NS_WARNING("We need precomputed tab widths, but they're not here...");
return nsnull;
}
} else {
if (!mLineContainer) {
// Intrinsic width computation, no way to compute real tab widths
// (and we wouldn't want to use it if we could, because it depends
// on layout). Don't wipe out existing tab widths that might still
// be useful for painting. Just return null which uses zero for
// all tab widths.
NS_WARNING("Preformatted tabs encountered in intrinsic width situation");
return nsnull;
}
nsAutoPtr<nsTArray<gfxFloat> > tabs(new nsTArray<gfxFloat>());
if (!tabs)
return nsnull;
nsresult rv = mFrame->SetProperty(nsGkAtoms::tabWidthProperty, tabs,
TabWidthDestructor, nsnull);
if (NS_FAILED(rv))
return nsnull;
mTabWidths = tabs.forget();
}
}
PRUint32 startOffset = mStart.GetSkippedOffset();
PRUint32 tabsEnd = startOffset + mTabWidths->Length();
if (tabsEnd < aStart + aLength) {
if (!mReflowing) {
NS_WARNING("We need precomputed tab widths, but we don't have enough...");
return nsnull;
}
if (!mTabWidths->AppendElements(aStart + aLength - tabsEnd))
return nsnull;
// Round the space width when converting to appunits the same way
// textruns do
gfxFloat spaceWidthAppUnits =
NS_roundf(GetFirstFontMetrics(
GetFontGroupForFrame(mLineContainer)).spaceWidth *
mTextRun->GetAppUnitsPerDevUnit());
gfxFloat tabWidth = 8*spaceWidthAppUnits;
for (PRUint32 i = tabsEnd; i < aStart + aLength; ++i) {
Spacing spacing;
GetSpacingInternal(i, 1, &spacing, PR_TRUE);
mOffsetFromBlockOriginForTabs += spacing.mBefore;
if (mTextRun->GetChar(i) != '\t') {
(*mTabWidths)[i - startOffset] = 0;
if (mTextRun->IsClusterStart(i)) {
PRUint32 clusterEnd = i + 1;
while (clusterEnd < mTextRun->GetLength() &&
!mTextRun->IsClusterStart(clusterEnd)) {
++clusterEnd;
}
mOffsetFromBlockOriginForTabs +=
mTextRun->GetAdvanceWidth(i, clusterEnd - i, nsnull);
}
} else {
// Advance mOffsetFromBlockOriginForTabs to the next multiple of
// tabWidth. We must advance by at least 1 appunit.
// XXX should we make this 1 CSS pixel?
double nextTab =
NS_ceil((mOffsetFromBlockOriginForTabs + 1)/tabWidth)*tabWidth;
(*mTabWidths)[i - startOffset] = nextTab - mOffsetFromBlockOriginForTabs;
mOffsetFromBlockOriginForTabs = nextTab;
}
mOffsetFromBlockOriginForTabs += spacing.mAfter;
}
}
return mTabWidths->Elements() + aStart - startOffset;
}
gfxFloat
PropertyProvider::GetHyphenWidth()
{
if (mHyphenWidth < 0) {
gfxTextRunCache::AutoTextRun hyphenTextRun(GetHyphenTextRun(mTextRun, nsnull, mFrame));
mHyphenWidth = mLetterSpacing;
if (hyphenTextRun.get()) {
mHyphenWidth += hyphenTextRun->GetAdvanceWidth(0, hyphenTextRun->GetLength(), nsnull);
}
}
return mHyphenWidth;
}
void
PropertyProvider::GetHyphenationBreaks(PRUint32 aStart, PRUint32 aLength,
PRPackedBool* aBreakBefore)
{
NS_PRECONDITION(IsInBounds(mStart, mLength, aStart, aLength), "Range out of bounds");
NS_PRECONDITION(mLength != PR_INT32_MAX, "Can't call this with undefined length");
if (!mTextStyle->WhiteSpaceCanWrap()) {
memset(aBreakBefore, PR_FALSE, aLength);
return;
}
// Iterate through the original-string character runs
nsSkipCharsRunIterator
run(mStart, nsSkipCharsRunIterator::LENGTH_UNSKIPPED_ONLY, aLength);
run.SetSkippedOffset(aStart);
// We need to visit skipped characters so that we can detect SHY
run.SetVisitSkipped();
PRInt32 prevTrailingCharOffset = run.GetPos().GetOriginalOffset() - 1;
PRBool allowHyphenBreakBeforeNextChar =
prevTrailingCharOffset >= mStart.GetOriginalOffset() &&
prevTrailingCharOffset < mStart.GetOriginalOffset() + mLength &&
mFrag->CharAt(prevTrailingCharOffset) == CH_SHY;
while (run.NextRun()) {
NS_ASSERTION(run.GetRunLength() > 0, "Shouldn't return zero-length runs");
if (run.IsSkipped()) {
// Check if there's a soft hyphen which would let us hyphenate before
// the next non-skipped character. Don't look at soft hyphens followed
// by other skipped characters, we won't use them.
allowHyphenBreakBeforeNextChar =
mFrag->CharAt(run.GetOriginalOffset() + run.GetRunLength() - 1) == CH_SHY;
} else {
PRInt32 runOffsetInSubstring = run.GetSkippedOffset() - aStart;
memset(aBreakBefore + runOffsetInSubstring, 0, run.GetRunLength());
// Don't allow hyphen breaks at the start of the line
aBreakBefore[runOffsetInSubstring] = allowHyphenBreakBeforeNextChar &&
(!(mFrame->GetStateBits() & TEXT_START_OF_LINE) ||
run.GetSkippedOffset() > mStart.GetSkippedOffset());
allowHyphenBreakBeforeNextChar = PR_FALSE;
}
}
}
void
PropertyProvider::InitializeForDisplay(PRBool aTrimAfter)
{
nsTextFrame::TrimmedOffsets trimmed =
mFrame->GetTrimmedOffsets(mFrag, aTrimAfter);
mStart.SetOriginalOffset(trimmed.mStart);
mLength = trimmed.mLength;
SetupJustificationSpacing();
}
static PRUint32 GetSkippedDistance(const gfxSkipCharsIterator& aStart,
const gfxSkipCharsIterator& aEnd)
{
return aEnd.GetSkippedOffset() - aStart.GetSkippedOffset();
}
void
PropertyProvider::FindJustificationRange(gfxSkipCharsIterator* aStart,
gfxSkipCharsIterator* aEnd)
{
NS_PRECONDITION(mLength != PR_INT32_MAX, "Can't call this with undefined length");
NS_ASSERTION(aStart && aEnd, "aStart or/and aEnd is null");
aStart->SetOriginalOffset(mStart.GetOriginalOffset());
aEnd->SetOriginalOffset(mStart.GetOriginalOffset() + mLength);
// Ignore first cluster at start of line for justification purposes
if (mFrame->GetStateBits() & TEXT_START_OF_LINE) {
while (aStart->GetOriginalOffset() < aEnd->GetOriginalOffset()) {
aStart->AdvanceOriginal(1);
if (!aStart->IsOriginalCharSkipped() &&
mTextRun->IsClusterStart(aStart->GetSkippedOffset()))
break;
}
}
// Ignore trailing cluster at end of line for justification purposes
if (mFrame->GetStateBits() & TEXT_END_OF_LINE) {
while (aEnd->GetOriginalOffset() > aStart->GetOriginalOffset()) {
aEnd->AdvanceOriginal(-1);
if (!aEnd->IsOriginalCharSkipped() &&
mTextRun->IsClusterStart(aEnd->GetSkippedOffset()))
break;
}
}
}
void
PropertyProvider::SetupJustificationSpacing()
{
NS_PRECONDITION(mLength != PR_INT32_MAX, "Can't call this with undefined length");
if (NS_STYLE_TEXT_ALIGN_JUSTIFY != mTextStyle->mTextAlign ||
mTextStyle->WhiteSpaceIsSignificant())
return;
gfxSkipCharsIterator start(mStart), end(mStart);
end.AdvanceOriginal(mLength);
gfxSkipCharsIterator realEnd(end);
FindJustificationRange(&start, &end);
PRInt32 justifiableCharacters =
ComputeJustifiableCharacters(start.GetOriginalOffset(),
end.GetOriginalOffset() - start.GetOriginalOffset());
if (justifiableCharacters == 0) {
// Nothing to do, nothing is justifiable and we shouldn't have any
// justification space assigned
return;
}
gfxFloat naturalWidth =
mTextRun->GetAdvanceWidth(mStart.GetSkippedOffset(),
GetSkippedDistance(mStart, realEnd), this);
if (mFrame->GetStateBits() & TEXT_HYPHEN_BREAK) {
gfxTextRunCache::AutoTextRun hyphenTextRun(GetHyphenTextRun(mTextRun, nsnull, mFrame));
if (hyphenTextRun.get()) {
naturalWidth +=
hyphenTextRun->GetAdvanceWidth(0, hyphenTextRun->GetLength(), nsnull);
}
}
gfxFloat totalJustificationSpace = mFrame->GetSize().width - naturalWidth;
if (totalJustificationSpace <= 0) {
// No space available
return;
}
mJustificationSpacing = totalJustificationSpace/justifiableCharacters;
}
//----------------------------------------------------------------------
// Helper class for managing blinking text
class nsBlinkTimer : public nsITimerCallback
{
public:
nsBlinkTimer();
virtual ~nsBlinkTimer();
NS_DECL_ISUPPORTS
void AddFrame(nsPresContext* aPresContext, nsIFrame* aFrame);
PRBool RemoveFrame(nsIFrame* aFrame);
PRInt32 FrameCount();
void Start();
void Stop();
NS_DECL_NSITIMERCALLBACK
static nsresult AddBlinkFrame(nsPresContext* aPresContext, nsIFrame* aFrame);
static nsresult RemoveBlinkFrame(nsIFrame* aFrame);
static PRBool GetBlinkIsOff() { return sState == 3; }
protected:
struct FrameData {
nsPresContext* mPresContext; // pres context associated with the frame
nsIFrame* mFrame;
FrameData(nsPresContext* aPresContext,
nsIFrame* aFrame)
: mPresContext(aPresContext), mFrame(aFrame) {}
};
nsCOMPtr<nsITimer> mTimer;
nsVoidArray mFrames;
nsPresContext* mPresContext;
protected:
static nsBlinkTimer* sTextBlinker;
static PRUint32 sState; // 0-2 == on; 3 == off
};
nsBlinkTimer* nsBlinkTimer::sTextBlinker = nsnull;
PRUint32 nsBlinkTimer::sState = 0;
#ifdef NOISY_BLINK
static PRTime gLastTick;
#endif
nsBlinkTimer::nsBlinkTimer()
{
}
nsBlinkTimer::~nsBlinkTimer()
{
Stop();
sTextBlinker = nsnull;
}
void nsBlinkTimer::Start()
{
nsresult rv;
mTimer = do_CreateInstance("@mozilla.org/timer;1", &rv);
if (NS_OK == rv) {
mTimer->InitWithCallback(this, 250, nsITimer::TYPE_REPEATING_PRECISE);
}
}
void nsBlinkTimer::Stop()
{
if (nsnull != mTimer) {
mTimer->Cancel();
mTimer = nsnull;
}
}
NS_IMPL_ISUPPORTS1(nsBlinkTimer, nsITimerCallback)
void nsBlinkTimer::AddFrame(nsPresContext* aPresContext, nsIFrame* aFrame) {
FrameData* frameData = new FrameData(aPresContext, aFrame);
mFrames.AppendElement(frameData);
if (1 == mFrames.Count()) {
Start();
}
}
PRBool nsBlinkTimer::RemoveFrame(nsIFrame* aFrame) {
PRInt32 i, n = mFrames.Count();
PRBool rv = PR_FALSE;
for (i = 0; i < n; i++) {
FrameData* frameData = (FrameData*) mFrames.ElementAt(i);
if (frameData->mFrame == aFrame) {
rv = mFrames.RemoveElementAt(i);
delete frameData;
break;
}
}
if (0 == mFrames.Count()) {
Stop();
}
return rv;
}
PRInt32 nsBlinkTimer::FrameCount() {
return mFrames.Count();
}
NS_IMETHODIMP nsBlinkTimer::Notify(nsITimer *timer)
{
// Toggle blink state bit so that text code knows whether or not to
// render. All text code shares the same flag so that they all blink
// in unison.
sState = (sState + 1) % 4;
if (sState == 1 || sState == 2)
// States 0, 1, and 2 are all the same.
return NS_OK;
#ifdef NOISY_BLINK
PRTime now = PR_Now();
char buf[50];
PRTime delta;
LL_SUB(delta, now, gLastTick);
gLastTick = now;
PR_snprintf(buf, sizeof(buf), "%lldusec", delta);
printf("%s\n", buf);
#endif
PRInt32 i, n = mFrames.Count();
for (i = 0; i < n; i++) {
FrameData* frameData = (FrameData*) mFrames.ElementAt(i);
// Determine damaged area and tell view manager to redraw it
// blink doesn't blink outline ... I hope
nsRect bounds(nsPoint(0, 0), frameData->mFrame->GetSize());
frameData->mFrame->Invalidate(bounds, PR_FALSE);
}
return NS_OK;
}
// static
nsresult nsBlinkTimer::AddBlinkFrame(nsPresContext* aPresContext, nsIFrame* aFrame)
{
if (!sTextBlinker)
{
sTextBlinker = new nsBlinkTimer;
if (!sTextBlinker) return NS_ERROR_OUT_OF_MEMORY;
}
NS_ADDREF(sTextBlinker);
sTextBlinker->AddFrame(aPresContext, aFrame);
return NS_OK;
}
// static
nsresult nsBlinkTimer::RemoveBlinkFrame(nsIFrame* aFrame)
{
NS_ASSERTION(sTextBlinker, "Should have blink timer here");
nsBlinkTimer* blinkTimer = sTextBlinker; // copy so we can call NS_RELEASE on it
if (!blinkTimer) return NS_OK;
blinkTimer->RemoveFrame(aFrame);
NS_RELEASE(blinkTimer);
return NS_OK;
}
//----------------------------------------------------------------------
static nscolor
EnsureDifferentColors(nscolor colorA, nscolor colorB)
{
if (colorA == colorB) {
nscolor res;
res = NS_RGB(NS_GET_R(colorA) ^ 0xff,
NS_GET_G(colorA) ^ 0xff,
NS_GET_B(colorA) ^ 0xff);
return res;
}
return colorA;
}
//-----------------------------------------------------------------------------
// TODO delete nsCSSRendering::TransformColor because we're moving it here
static nscolor
DarkenColor(nscolor aColor)
{
PRUint16 hue,sat,value;
// convert the RBG to HSV so we can get the lightness (which is the v)
NS_RGB2HSV(aColor,hue,sat,value);
// The goal here is to send white to black while letting colored
// stuff stay colored... So we adopt the following approach.
// Something with sat = 0 should end up with value = 0. Something
// with a high sat can end up with a high value and it's ok.... At
// the same time, we don't want to make things lighter. Do
// something simple, since it seems to work.
if (value > sat) {
value = sat;
// convert this color back into the RGB color space.
NS_HSV2RGB(aColor,hue,sat,value);
}
return aColor;
}
// Check whether we should darken text colors. We need to do this if
// background images and colors are being suppressed, because that means
// light text will not be visible against the (presumed light-colored) background.
static PRBool
ShouldDarkenColors(nsPresContext* aPresContext)
{
return !aPresContext->GetBackgroundColorDraw() &&
!aPresContext->GetBackgroundImageDraw();
}
nsTextPaintStyle::nsTextPaintStyle(nsTextFrame* aFrame)
: mFrame(aFrame),
mPresContext(aFrame->PresContext()),
mInitCommonColors(PR_FALSE),
mInitSelectionColors(PR_FALSE)
{
for (int i = 0; i < 4; i++)
mIMEStyle[i].mInit = PR_FALSE;
mIMEUnderlineRelativeSize = -1.0f;
}
PRBool
nsTextPaintStyle::EnsureSufficientContrast(nscolor *aForeColor, nscolor *aBackColor)
{
InitCommonColors();
// If the combination of selection background color and frame background color
// is sufficient contrast, don't exchange the selection colors.
PRInt32 backLuminosityDifference =
NS_LUMINOSITY_DIFFERENCE(*aBackColor, mFrameBackgroundColor);
if (backLuminosityDifference >= mSufficientContrast)
return PR_FALSE;
// Otherwise, we should use the higher-contrast color for the selection
// background color.
PRInt32 foreLuminosityDifference =
NS_LUMINOSITY_DIFFERENCE(*aForeColor, mFrameBackgroundColor);
if (backLuminosityDifference < foreLuminosityDifference) {
nscolor tmpColor = *aForeColor;
*aForeColor = *aBackColor;
*aBackColor = tmpColor;
return PR_TRUE;
}
return PR_FALSE;
}
nscolor
nsTextPaintStyle::GetTextColor()
{
nscolor color = mFrame->GetStyleColor()->mColor;
if (ShouldDarkenColors(mPresContext)) {
color = DarkenColor(color);
}
return color;
}
PRBool
nsTextPaintStyle::GetSelectionColors(nscolor* aForeColor,
nscolor* aBackColor)
{
NS_ASSERTION(aForeColor, "aForeColor is null");
NS_ASSERTION(aBackColor, "aBackColor is null");
if (!InitSelectionColors())
return PR_FALSE;
*aForeColor = mSelectionTextColor;
*aBackColor = mSelectionBGColor;
return PR_TRUE;
}
void
nsTextPaintStyle::GetHighlightColors(nscolor* aForeColor,
nscolor* aBackColor)
{
NS_ASSERTION(aForeColor, "aForeColor is null");
NS_ASSERTION(aBackColor, "aBackColor is null");
nsILookAndFeel* look = mPresContext->LookAndFeel();
nscolor foreColor, backColor;
look->GetColor(nsILookAndFeel::eColor_TextHighlightBackground,
backColor);
look->GetColor(nsILookAndFeel::eColor_TextSelectForeground,
foreColor);
EnsureSufficientContrast(&foreColor, &backColor);
*aForeColor = foreColor;
*aBackColor = backColor;
}
void
nsTextPaintStyle::GetIMESelectionColors(PRInt32 aIndex,
nscolor* aForeColor,
nscolor* aBackColor)
{
NS_ASSERTION(aForeColor, "aForeColor is null");
NS_ASSERTION(aBackColor, "aBackColor is null");
NS_ASSERTION(aIndex >= 0 && aIndex < 4, "Index out of range");
nsIMEStyle* IMEStyle = GetIMEStyle(aIndex);
*aForeColor = IMEStyle->mTextColor;
*aBackColor = IMEStyle->mBGColor;
}
PRBool
nsTextPaintStyle::GetIMEUnderline(PRInt32 aIndex,
nscolor* aLineColor,
float* aRelativeSize,
PRUint8* aStyle)
{
NS_ASSERTION(aLineColor, "aLineColor is null");
NS_ASSERTION(aRelativeSize, "aRelativeSize is null");
NS_ASSERTION(aIndex >= 0 && aIndex < 4, "Index out of range");
nsIMEStyle* IMEStyle = GetIMEStyle(aIndex);
if (IMEStyle->mUnderlineStyle == NS_STYLE_BORDER_STYLE_NONE ||
IMEStyle->mUnderlineColor == NS_TRANSPARENT ||
mIMEUnderlineRelativeSize <= 0.0f)
return PR_FALSE;
*aLineColor = IMEStyle->mUnderlineColor;
*aRelativeSize = mIMEUnderlineRelativeSize;
*aStyle = IMEStyle->mUnderlineStyle;
return PR_TRUE;
}
void
nsTextPaintStyle::InitCommonColors()
{
if (mInitCommonColors)
return;
nsStyleContext* sc = mFrame->GetStyleContext();
const nsStyleBackground* bg =
nsCSSRendering::FindNonTransparentBackground(sc);
NS_ASSERTION(bg, "Cannot find NonTransparentBackground.");
mFrameBackgroundColor = bg->mBackgroundColor;
nsILookAndFeel* look = mPresContext->LookAndFeel();
nscolor defaultWindowBackgroundColor, selectionTextColor, selectionBGColor;
look->GetColor(nsILookAndFeel::eColor_TextSelectBackground,
selectionBGColor);
look->GetColor(nsILookAndFeel::eColor_TextSelectForeground,
selectionTextColor);
look->GetColor(nsILookAndFeel::eColor_WindowBackground,
defaultWindowBackgroundColor);
mSufficientContrast =
PR_MIN(PR_MIN(NS_SUFFICIENT_LUMINOSITY_DIFFERENCE,
NS_LUMINOSITY_DIFFERENCE(selectionTextColor,
selectionBGColor)),
NS_LUMINOSITY_DIFFERENCE(defaultWindowBackgroundColor,
selectionBGColor));
mInitCommonColors = PR_TRUE;
}
static nsIFrame* GetNonGeneratedAncestor(nsIFrame* f) {
while (f->GetStateBits() & NS_FRAME_GENERATED_CONTENT) {
f = f->GetParent();
}
return f;
}
static nsIContent*
FindElementAncestor(nsINode* aNode)
{
while (aNode && !aNode->IsNodeOfType(nsINode::eELEMENT)) {
aNode = aNode->GetParent();
}
return static_cast<nsIContent*>(aNode);
}
PRBool
nsTextPaintStyle::InitSelectionColors()
{
if (mInitSelectionColors)
return PR_TRUE;
PRInt16 selectionFlags;
PRInt16 selectionStatus = mFrame->GetSelectionStatus(&selectionFlags);
if (!(selectionFlags & nsISelectionDisplay::DISPLAY_TEXT) ||
selectionStatus < nsISelectionController::SELECTION_ON) {
// Not displaying the normal selection.
// We're not caching this fact, so every call to GetSelectionColors
// will come through here. We could avoid this, but it's not really worth it.
return PR_FALSE;
}
mInitSelectionColors = PR_TRUE;
nsIFrame* nonGeneratedAncestor = GetNonGeneratedAncestor(mFrame);
nsIContent* selectionContent = FindElementAncestor(nonGeneratedAncestor->GetContent());
if (selectionContent &&
selectionStatus == nsISelectionController::SELECTION_ON) {
nsRefPtr<nsStyleContext> sc = nsnull;
sc = mPresContext->StyleSet()->
ProbePseudoStyleFor(selectionContent, nsCSSPseudoElements::mozSelection,
mFrame->GetStyleContext());
// Use -moz-selection pseudo class.
if (sc) {
const nsStyleBackground* bg = sc->GetStyleBackground();
mSelectionBGColor = bg->mBackgroundColor;
if (bg->mBackgroundFlags & NS_STYLE_BG_COLOR_TRANSPARENT) {
mSelectionBGColor = NS_RGBA(0,0,0,0);
}
mSelectionTextColor = sc->GetStyleColor()->mColor;
return PR_TRUE;
}
}
nsILookAndFeel* look = mPresContext->LookAndFeel();
nscolor selectionBGColor;
look->GetColor(nsILookAndFeel::eColor_TextSelectBackground,
selectionBGColor);
if (selectionStatus == nsISelectionController::SELECTION_ATTENTION) {
look->GetColor(nsILookAndFeel::eColor_TextSelectBackgroundAttention,
mSelectionBGColor);
mSelectionBGColor = EnsureDifferentColors(mSelectionBGColor,
selectionBGColor);
} else if (selectionStatus != nsISelectionController::SELECTION_ON) {
look->GetColor(nsILookAndFeel::eColor_TextSelectBackgroundDisabled,
mSelectionBGColor);
mSelectionBGColor = EnsureDifferentColors(mSelectionBGColor,
selectionBGColor);
} else {
mSelectionBGColor = selectionBGColor;
}
look->GetColor(nsILookAndFeel::eColor_TextSelectForeground,
mSelectionTextColor);
// On MacOS X, we don't exchange text color and BG color.
if (mSelectionTextColor == NS_DONT_CHANGE_COLOR) {
mSelectionTextColor = EnsureDifferentColors(mFrame->GetStyleColor()->mColor,
mSelectionBGColor);
} else {
EnsureSufficientContrast(&mSelectionTextColor, &mSelectionBGColor);
}
return PR_TRUE;
}
nsTextPaintStyle::nsIMEStyle*
nsTextPaintStyle::GetIMEStyle(PRInt32 aIndex)
{
InitIMEStyle(aIndex);
return &mIMEStyle[aIndex];
}
struct StyleIDs {
nsILookAndFeel::nsColorID mForeground, mBackground, mLine;
nsILookAndFeel::nsMetricID mLineStyle;
};
static StyleIDs IMEStyleIDs[] = {
{ nsILookAndFeel::eColor_IMERawInputForeground,
nsILookAndFeel::eColor_IMERawInputBackground,
nsILookAndFeel::eColor_IMERawInputUnderline,
nsILookAndFeel::eMetric_IMERawInputUnderlineStyle },
{ nsILookAndFeel::eColor_IMESelectedRawTextForeground,
nsILookAndFeel::eColor_IMESelectedRawTextBackground,
nsILookAndFeel::eColor_IMESelectedRawTextUnderline,
nsILookAndFeel::eMetric_IMESelectedRawTextUnderlineStyle },
{ nsILookAndFeel::eColor_IMEConvertedTextForeground,
nsILookAndFeel::eColor_IMEConvertedTextBackground,
nsILookAndFeel::eColor_IMEConvertedTextUnderline,
nsILookAndFeel::eMetric_IMEConvertedTextUnderlineStyle },
{ nsILookAndFeel::eColor_IMESelectedConvertedTextForeground,
nsILookAndFeel::eColor_IMESelectedConvertedTextBackground,
nsILookAndFeel::eColor_IMESelectedConvertedTextUnderline,
nsILookAndFeel::eMetric_IMESelectedConvertedTextUnderline }
};
static PRUint8 sUnderlineStyles[] = {
NS_STYLE_BORDER_STYLE_NONE, // NS_UNDERLINE_STYLE_NONE 0
NS_STYLE_BORDER_STYLE_DOTTED, // NS_UNDERLINE_STYLE_DOTTED 1
NS_STYLE_BORDER_STYLE_DASHED, // NS_UNDERLINE_STYLE_DASHED 2
NS_STYLE_BORDER_STYLE_SOLID, // NS_UNDERLINE_STYLE_SOLID 3
NS_STYLE_BORDER_STYLE_DOUBLE // NS_UNDERLINE_STYLE_DOUBLE 4
};
void
nsTextPaintStyle::InitIMEStyle(PRInt32 aIndex)
{
nsIMEStyle* IMEStyle = &mIMEStyle[aIndex];
if (IMEStyle->mInit)
return;
StyleIDs* styleIDs = &IMEStyleIDs[aIndex];
nsILookAndFeel* look = mPresContext->LookAndFeel();
nscolor foreColor, backColor, lineColor;
PRInt32 lineStyle;
look->GetColor(styleIDs->mForeground, foreColor);
look->GetColor(styleIDs->mBackground, backColor);
look->GetColor(styleIDs->mLine, lineColor);
look->GetMetric(styleIDs->mLineStyle, lineStyle);
// Convert special color to actual color
NS_ASSERTION(foreColor != NS_TRANSPARENT,
"foreColor cannot be NS_TRANSPARENT");
NS_ASSERTION(backColor != NS_SAME_AS_FOREGROUND_COLOR,
"backColor cannot be NS_SAME_AS_FOREGROUND_COLOR");
NS_ASSERTION(backColor != NS_40PERCENT_FOREGROUND_COLOR,
"backColor cannot be NS_40PERCENT_FOREGROUND_COLOR");
foreColor = GetResolvedForeColor(foreColor, GetTextColor(), backColor);
if (NS_GET_A(backColor) > 0)
EnsureSufficientContrast(&foreColor, &backColor);
lineColor = GetResolvedForeColor(lineColor, foreColor, backColor);
if (!NS_IS_VALID_UNDERLINE_STYLE(lineStyle))
lineStyle = NS_UNDERLINE_STYLE_SOLID;
IMEStyle->mTextColor = foreColor;
IMEStyle->mBGColor = backColor;
IMEStyle->mUnderlineColor = lineColor;
IMEStyle->mUnderlineStyle = sUnderlineStyles[lineStyle];
IMEStyle->mInit = PR_TRUE;
if (mIMEUnderlineRelativeSize == -1.0f) {
look->GetMetric(nsILookAndFeel::eMetricFloat_IMEUnderlineRelativeSize,
mIMEUnderlineRelativeSize);
NS_ASSERTION(mIMEUnderlineRelativeSize >= 0.0f,
"underline size must be larger than 0");
}
}
inline nscolor Get40PercentColor(nscolor aForeColor, nscolor aBackColor)
{
nscolor foreColor = NS_RGBA(NS_GET_R(aForeColor),
NS_GET_G(aForeColor),
NS_GET_B(aForeColor),
(PRUint8)(255 * 0.4f));
// Don't use true alpha color for readability.
return NS_ComposeColors(aBackColor, foreColor);
}
nscolor
nsTextPaintStyle::GetResolvedForeColor(nscolor aColor,
nscolor aDefaultForeColor,
nscolor aBackColor)
{
if (aColor == NS_SAME_AS_FOREGROUND_COLOR)
return aDefaultForeColor;
if (aColor != NS_40PERCENT_FOREGROUND_COLOR)
return aColor;
// Get actual background color
nscolor actualBGColor = aBackColor;
if (actualBGColor == NS_TRANSPARENT) {
InitCommonColors();
actualBGColor = mFrameBackgroundColor;
}
return Get40PercentColor(aDefaultForeColor, actualBGColor);
}
//-----------------------------------------------------------------------------
#ifdef ACCESSIBILITY
NS_IMETHODIMP nsTextFrame::GetAccessible(nsIAccessible** aAccessible)
{
if (IsEmpty()) {
nsAutoString renderedWhitespace;
GetRenderedText(&renderedWhitespace, nsnull, nsnull, 0, 1);
if (renderedWhitespace.IsEmpty()) {
return NS_ERROR_FAILURE;
}
}
nsCOMPtr<nsIAccessibilityService> accService = do_GetService("@mozilla.org/accessibilityService;1");
if (accService) {
return accService->CreateHTMLTextAccessible(static_cast<nsIFrame*>(this), aAccessible);
}
return NS_ERROR_FAILURE;
}
#endif
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsTextFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
NS_ASSERTION(!aPrevInFlow, "Can't be a continuation!");
NS_PRECONDITION(aContent->IsNodeOfType(nsINode::eTEXT),
"Bogus content!");
// We're not a continuing frame.
// mContentOffset = 0; not necessary since we get zeroed out at init
return nsFrame::Init(aContent, aParent, aPrevInFlow);
}
void
nsTextFrame::Destroy()
{
ClearTextRun();
if (mNextContinuation) {
mNextContinuation->SetPrevInFlow(nsnull);
}
// Let the base class destroy the frame
nsFrame::Destroy();
}
class nsContinuingTextFrame : public nsTextFrame {
public:
friend nsIFrame* NS_NewContinuingTextFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
NS_IMETHOD Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow);
virtual void Destroy();
virtual nsIFrame* GetPrevContinuation() const {
return mPrevContinuation;
}
NS_IMETHOD SetPrevContinuation(nsIFrame* aPrevContinuation) {
NS_ASSERTION (!aPrevContinuation || GetType() == aPrevContinuation->GetType(),
"setting a prev continuation with incorrect type!");
NS_ASSERTION (!nsSplittableFrame::IsInPrevContinuationChain(aPrevContinuation, this),
"creating a loop in continuation chain!");
mPrevContinuation = aPrevContinuation;
RemoveStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
return NS_OK;
}
virtual nsIFrame* GetPrevInFlowVirtual() const { return GetPrevInFlow(); }
nsIFrame* GetPrevInFlow() const {
return (GetStateBits() & NS_FRAME_IS_FLUID_CONTINUATION) ? mPrevContinuation : nsnull;
}
NS_IMETHOD SetPrevInFlow(nsIFrame* aPrevInFlow) {
NS_ASSERTION (!aPrevInFlow || GetType() == aPrevInFlow->GetType(),
"setting a prev in flow with incorrect type!");
NS_ASSERTION (!nsSplittableFrame::IsInPrevContinuationChain(aPrevInFlow, this),
"creating a loop in continuation chain!");
mPrevContinuation = aPrevInFlow;
AddStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
return NS_OK;
}
virtual nsIFrame* GetFirstInFlow() const;
virtual nsIFrame* GetFirstContinuation() const;
virtual void AddInlineMinWidth(nsIRenderingContext *aRenderingContext,
InlineMinWidthData *aData);
virtual void AddInlinePrefWidth(nsIRenderingContext *aRenderingContext,
InlinePrefWidthData *aData);
virtual nsresult GetRenderedText(nsAString* aString = nsnull,
gfxSkipChars* aSkipChars = nsnull,
gfxSkipCharsIterator* aSkipIter = nsnull,
PRUint32 aSkippedStartOffset = 0,
PRUint32 aSkippedMaxLength = PR_UINT32_MAX)
{ return NS_ERROR_NOT_IMPLEMENTED; } // Call on a primary text frame only
protected:
nsContinuingTextFrame(nsStyleContext* aContext) : nsTextFrame(aContext) {}
nsIFrame* mPrevContinuation;
};
NS_IMETHODIMP
nsContinuingTextFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
NS_ASSERTION(aPrevInFlow, "Must be a continuation!");
// NOTE: bypassing nsTextFrame::Init!!!
nsresult rv = nsFrame::Init(aContent, aParent, aPrevInFlow);
#ifdef IBMBIDI
nsTextFrame* nextContinuation =
static_cast<nsTextFrame*>(aPrevInFlow->GetNextContinuation());
#endif // IBMBIDI
// Hook the frame into the flow
SetPrevInFlow(aPrevInFlow);
aPrevInFlow->SetNextInFlow(this);
nsTextFrame* prev = static_cast<nsTextFrame*>(aPrevInFlow);
mContentOffset = prev->GetContentOffset() + prev->GetContentLengthHint();
NS_ASSERTION(mContentOffset < PRInt32(aContent->GetText()->GetLength()),
"Creating ContinuingTextFrame, but there is no more content");
if (prev->GetStyleContext() != GetStyleContext()) {
// We're taking part of prev's text, and its style may be different
// so clear its textrun which may no longer be valid (and don't set ours)
prev->ClearTextRun();
} else {
mTextRun = prev->GetTextRun();
}
#ifdef IBMBIDI
if (aPrevInFlow->GetStateBits() & NS_FRAME_IS_BIDI) {
nsPropertyTable *propTable = PresContext()->PropertyTable();
propTable->SetProperty(this, nsGkAtoms::embeddingLevel,
propTable->GetProperty(aPrevInFlow, nsGkAtoms::embeddingLevel),
nsnull, nsnull);
propTable->SetProperty(this, nsGkAtoms::baseLevel,
propTable->GetProperty(aPrevInFlow, nsGkAtoms::baseLevel),
nsnull, nsnull);
propTable->SetProperty(this, nsGkAtoms::charType,
propTable->GetProperty(aPrevInFlow, nsGkAtoms::charType),
nsnull, nsnull);
if (nextContinuation) {
SetNextContinuation(nextContinuation);
nextContinuation->SetPrevContinuation(this);
// Adjust next-continuations' content offset as needed.
while (nextContinuation &&
nextContinuation->GetContentOffset() < mContentOffset) {
NS_ASSERTION(
propTable->GetProperty(this, nsGkAtoms::embeddingLevel) ==
propTable->GetProperty(nextContinuation, nsGkAtoms::embeddingLevel) &&
propTable->GetProperty(this, nsGkAtoms::baseLevel) ==
propTable->GetProperty(nextContinuation, nsGkAtoms::baseLevel) &&
propTable->GetProperty(this, nsGkAtoms::charType) ==
propTable->GetProperty(nextContinuation, nsGkAtoms::charType),
"stealing text from different type of BIDI continuation");
nextContinuation->mContentOffset = mContentOffset;
nextContinuation = static_cast<nsTextFrame*>(nextContinuation->GetNextContinuation());
}
}
mState |= NS_FRAME_IS_BIDI;
} // prev frame is bidi
#endif // IBMBIDI
return rv;
}
void
nsContinuingTextFrame::Destroy()
{
ClearTextRun();
if (mPrevContinuation || mNextContinuation) {
nsSplittableFrame::RemoveFromFlow(this);
}
// Let the base class destroy the frame
nsFrame::Destroy();
}
nsIFrame*
nsContinuingTextFrame::GetFirstInFlow() const
{
// Can't cast to |nsContinuingTextFrame*| because the first one isn't.
nsIFrame *firstInFlow,
*previous = const_cast<nsIFrame*>
(static_cast<const nsIFrame*>(this));
do {
firstInFlow = previous;
previous = firstInFlow->GetPrevInFlow();
} while (previous);
return firstInFlow;
}
nsIFrame*
nsContinuingTextFrame::GetFirstContinuation() const
{
// Can't cast to |nsContinuingTextFrame*| because the first one isn't.
nsIFrame *firstContinuation,
*previous = const_cast<nsIFrame*>
(static_cast<const nsIFrame*>(mPrevContinuation));
NS_ASSERTION(previous, "How can an nsContinuingTextFrame be the first continuation?");
do {
firstContinuation = previous;
previous = firstContinuation->GetPrevContinuation();
} while (previous);
return firstContinuation;
}
// XXX Do we want to do all the work for the first-in-flow or do the
// work for each part? (Be careful of first-letter / first-line, though,
// especially first-line!) Doing all the work on the first-in-flow has
// the advantage of avoiding the potential for incremental reflow bugs,
// but depends on our maintining the frame tree in reasonable ways even
// for edge cases (block-within-inline splits, nextBidi, etc.)
// XXX We really need to make :first-letter happen during frame
// construction.
// Needed for text frames in XUL.
/* virtual */ nscoord
nsTextFrame::GetMinWidth(nsIRenderingContext *aRenderingContext)
{
return nsLayoutUtils::MinWidthFromInline(this, aRenderingContext);
}
// Needed for text frames in XUL.
/* virtual */ nscoord
nsTextFrame::GetPrefWidth(nsIRenderingContext *aRenderingContext)
{
return nsLayoutUtils::PrefWidthFromInline(this, aRenderingContext);
}
/* virtual */ void
nsContinuingTextFrame::AddInlineMinWidth(nsIRenderingContext *aRenderingContext,
InlineMinWidthData *aData)
{
// Do nothing, since the first-in-flow accounts for everything.
return;
}
/* virtual */ void
nsContinuingTextFrame::AddInlinePrefWidth(nsIRenderingContext *aRenderingContext,
InlinePrefWidthData *aData)
{
// Do nothing, since the first-in-flow accounts for everything.
return;
}
static void
DestroySelectionDetails(SelectionDetails* aDetails)
{
while (aDetails) {
SelectionDetails* next = aDetails->mNext;
delete aDetails;
aDetails = next;
}
}
//----------------------------------------------------------------------
#if defined(DEBUG_rbs) || defined(DEBUG_bzbarsky)
static void
VerifyNotDirty(nsFrameState state)
{
PRBool isZero = state & NS_FRAME_FIRST_REFLOW;
PRBool isDirty = state & NS_FRAME_IS_DIRTY;
if (!isZero && isDirty)
NS_WARNING("internal offsets may be out-of-sync");
}
#define DEBUG_VERIFY_NOT_DIRTY(state) \
VerifyNotDirty(state)
#else
#define DEBUG_VERIFY_NOT_DIRTY(state)
#endif
nsIFrame*
NS_NewTextFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsTextFrame(aContext);
}
nsIFrame*
NS_NewContinuingTextFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsContinuingTextFrame(aContext);
}
nsTextFrame::~nsTextFrame()
{
if (0 != (mState & TEXT_BLINK_ON))
{
nsBlinkTimer::RemoveBlinkFrame(this);
}
}
NS_IMETHODIMP
nsTextFrame::GetCursor(const nsPoint& aPoint,
nsIFrame::Cursor& aCursor)
{
FillCursorInformationFromStyle(GetStyleUserInterface(), aCursor);
if (NS_STYLE_CURSOR_AUTO == aCursor.mCursor) {
aCursor.mCursor = NS_STYLE_CURSOR_TEXT;
// If tabindex >= 0, use default cursor to indicate it's not selectable
nsIFrame *ancestorFrame = this;
while ((ancestorFrame = ancestorFrame->GetParent()) != nsnull) {
nsIContent *ancestorContent = ancestorFrame->GetContent();
if (ancestorContent && ancestorContent->HasAttr(kNameSpaceID_None, nsGkAtoms::tabindex)) {
nsAutoString tabIndexStr;
ancestorContent->GetAttr(kNameSpaceID_None, nsGkAtoms::tabindex, tabIndexStr);
if (!tabIndexStr.IsEmpty()) {
PRInt32 rv, tabIndexVal = tabIndexStr.ToInteger(&rv);
if (NS_SUCCEEDED(rv) && tabIndexVal >= 0) {
aCursor.mCursor = NS_STYLE_CURSOR_DEFAULT;
break;
}
}
}
}
}
return NS_OK;
}
nsIFrame*
nsTextFrame::GetLastInFlow() const
{
nsTextFrame* lastInFlow = const_cast<nsTextFrame*>(this);
while (lastInFlow->GetNextInFlow()) {
lastInFlow = static_cast<nsTextFrame*>(lastInFlow->GetNextInFlow());
}
NS_POSTCONDITION(lastInFlow, "illegal state in flow chain.");
return lastInFlow;
}
nsIFrame*
nsTextFrame::GetLastContinuation() const
{
nsTextFrame* lastInFlow = const_cast<nsTextFrame*>(this);
while (lastInFlow->mNextContinuation) {
lastInFlow = static_cast<nsTextFrame*>(lastInFlow->mNextContinuation);
}
NS_POSTCONDITION(lastInFlow, "illegal state in continuation chain.");
return lastInFlow;
}
void
nsTextFrame::ClearTextRun()
{
// save textrun because ClearAllTextRunReferences will clear ours
gfxTextRun* textRun = mTextRun;
if (!textRun)
return;
UnhookTextRunFromFrames(textRun);
// see comments in BuildTextRunForFrames...
// if (textRun->GetFlags() & gfxFontGroup::TEXT_IS_PERSISTENT) {
// NS_ERROR("Shouldn't reach here for now...");
// // the textrun's text may be referencing a DOM node that has changed,
// // so we'd better kill this textrun now.
// if (textRun->GetExpirationState()->IsTracked()) {
// gTextRuns->RemoveFromCache(textRun);
// }
// delete textRun;
// return;
// }
if (!(textRun->GetFlags() & gfxTextRunWordCache::TEXT_IN_CACHE)) {
// Remove it now because it's not doing anything useful
gTextRuns->RemoveFromCache(textRun);
delete textRun;
}
}
static void
ClearTextRunsInFlowChain(nsTextFrame* aFrame)
{
nsTextFrame* f;
for (f = aFrame; f; f = static_cast<nsTextFrame*>(f->GetNextInFlow())) {
f->ClearTextRun();
}
}
NS_IMETHODIMP
nsTextFrame::CharacterDataChanged(nsPresContext* aPresContext,
nsIContent* aChild,
PRBool aAppend)
{
ClearTextRunsInFlowChain(this);
nsTextFrame* targetTextFrame;
PRInt32 nodeLength = mContent->GetText()->GetLength();
if (aAppend) {
targetTextFrame = static_cast<nsTextFrame*>(GetLastContinuation());
targetTextFrame->mState &= ~TEXT_WHITESPACE_FLAGS;
} else {
// Mark all the continuation frames as dirty, and fix up content offsets to
// be valid.
// Don't set NS_FRAME_IS_DIRTY on |this|, since we call FrameNeedsReflow
// below.
nsTextFrame* textFrame = this;
PRInt32 newLength = nodeLength;
do {
textFrame->mState &= ~TEXT_WHITESPACE_FLAGS;
// If the text node has shrunk, clip the frame contentlength as necessary
if (textFrame->mContentOffset > newLength) {
textFrame->mContentOffset = newLength;
}
textFrame = static_cast<nsTextFrame*>(textFrame->GetNextContinuation());
if (!textFrame) {
break;
}
textFrame->mState |= NS_FRAME_IS_DIRTY;
} while (1);
targetTextFrame = this;
}
// Ask the parent frame to reflow me.
aPresContext->GetPresShell()->FrameNeedsReflow(targetTextFrame,
nsIPresShell::eStyleChange,
NS_FRAME_IS_DIRTY);
return NS_OK;
}
NS_IMETHODIMP
nsTextFrame::DidSetStyleContext()
{
ClearTextRun();
return NS_OK;
}
class nsDisplayText : public nsDisplayItem {
public:
nsDisplayText(nsTextFrame* aFrame) : nsDisplayItem(aFrame) {
MOZ_COUNT_CTOR(nsDisplayText);
}
#ifdef NS_BUILD_REFCNT_LOGGING
virtual ~nsDisplayText() {
MOZ_COUNT_DTOR(nsDisplayText);
}
#endif
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder) {
return mFrame->GetOverflowRect() + aBuilder->ToReferenceFrame(mFrame);
}
virtual nsIFrame* HitTest(nsDisplayListBuilder* aBuilder, nsPoint aPt,
HitTestState* aState) {
return nsRect(aBuilder->ToReferenceFrame(mFrame), mFrame->GetSize()).Contains(aPt) ? mFrame : nsnull;
}
virtual void Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx,
const nsRect& aDirtyRect);
NS_DISPLAY_DECL_NAME("Text")
};
void
nsDisplayText::Paint(nsDisplayListBuilder* aBuilder,
nsIRenderingContext* aCtx, const nsRect& aDirtyRect) {
static_cast<nsTextFrame*>(mFrame)->
PaintText(aCtx, aBuilder->ToReferenceFrame(mFrame), aDirtyRect);
}
NS_IMETHODIMP
nsTextFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
if (!IsVisibleForPainting(aBuilder))
return NS_OK;
DO_GLOBAL_REFLOW_COUNT_DSP("nsTextFrame");
if ((0 != (mState & TEXT_BLINK_ON)) && nsBlinkTimer::GetBlinkIsOff() &&
PresContext()->IsDynamic())
return NS_OK;
return aLists.Content()->AppendNewToTop(new (aBuilder) nsDisplayText(this));
}
static nsIFrame*
GetGeneratedContentOwner(nsIFrame* aFrame, PRBool* aIsBefore)
{
*aIsBefore = PR_FALSE;
while (aFrame && (aFrame->GetStateBits() & NS_FRAME_GENERATED_CONTENT)) {
if (aFrame->GetStyleContext()->GetPseudoType() == nsCSSPseudoElements::before) {
*aIsBefore = PR_TRUE;
}
aFrame = aFrame->GetParent();
}
return aFrame;
}
SelectionDetails*
nsTextFrame::GetSelectionDetails()
{
const nsFrameSelection* frameSelection = GetConstFrameSelection();
if (!(GetStateBits() & NS_FRAME_GENERATED_CONTENT)) {
SelectionDetails* details =
frameSelection->LookUpSelection(mContent, GetContentOffset(),
GetContentLength(), PR_FALSE);
SelectionDetails* sd;
for (sd = details; sd; sd = sd->mNext) {
sd->mStart += mContentOffset;
sd->mEnd += mContentOffset;
}
return details;
}
// Check if the beginning or end of the element is selected, depending on
// whether we're :before content or :after content.
PRBool isBefore;
nsIFrame* owner = GetGeneratedContentOwner(this, &isBefore);
if (!owner || !owner->GetContent())
return nsnull;
SelectionDetails* details =
frameSelection->LookUpSelection(owner->GetContent(),
isBefore ? 0 : owner->GetContent()->GetChildCount(), 0, PR_FALSE);
SelectionDetails* sd;
for (sd = details; sd; sd = sd->mNext) {
// The entire text is selected!
sd->mStart = GetContentOffset();
sd->mEnd = GetContentEnd();
}
return details;
}
static void
FillClippedRect(gfxContext* aCtx, nsPresContext* aPresContext,
nscolor aColor, const gfxRect& aDirtyRect, const gfxRect& aRect)
{
gfxRect r = aRect.Intersect(aDirtyRect);
// For now, we need to put this in pixel coordinates
PRInt32 app = aPresContext->AppUnitsPerDevPixel();
aCtx->NewPath();
// pixel-snap
aCtx->Rectangle(gfxRect(r.X() / app, r.Y() / app,
r.Width() / app, r.Height() / app), PR_TRUE);
aCtx->SetColor(gfxRGBA(aColor));
aCtx->Fill();
}
nsTextFrame::TextDecorations
nsTextFrame::GetTextDecorations(nsPresContext* aPresContext)
{
TextDecorations decorations;
// Quirks mode text decoration are rendered by children; see bug 1777
// In non-quirks mode, nsHTMLContainer::Paint and nsBlockFrame::Paint
// does the painting of text decorations.
if (eCompatibility_NavQuirks != aPresContext->CompatibilityMode())
return decorations;
PRBool useOverride = PR_FALSE;
nscolor overrideColor;
// A mask of all possible decorations.
PRUint8 decorMask = NS_STYLE_TEXT_DECORATION_UNDERLINE |
NS_STYLE_TEXT_DECORATION_OVERLINE |
NS_STYLE_TEXT_DECORATION_LINE_THROUGH;
for (nsStyleContext* context = GetStyleContext();
decorMask && context && context->HasTextDecorations();
context = context->GetParent()) {
const nsStyleTextReset* styleText = context->GetStyleTextReset();
if (!useOverride &&
(NS_STYLE_TEXT_DECORATION_OVERRIDE_ALL & styleText->mTextDecoration)) {
// This handles the <a href="blah.html"><font color="green">La
// la la</font></a> case. The link underline should be green.
useOverride = PR_TRUE;
overrideColor = context->GetStyleColor()->mColor;
}
PRUint8 useDecorations = decorMask & styleText->mTextDecoration;
if (useDecorations) {// a decoration defined here
nscolor color = context->GetStyleColor()->mColor;
if (NS_STYLE_TEXT_DECORATION_UNDERLINE & useDecorations) {
decorations.mUnderColor = useOverride ? overrideColor : color;
decorMask &= ~NS_STYLE_TEXT_DECORATION_UNDERLINE;
decorations.mDecorations |= NS_STYLE_TEXT_DECORATION_UNDERLINE;
}
if (NS_STYLE_TEXT_DECORATION_OVERLINE & useDecorations) {
decorations.mOverColor = useOverride ? overrideColor : color;
decorMask &= ~NS_STYLE_TEXT_DECORATION_OVERLINE;
decorations.mDecorations |= NS_STYLE_TEXT_DECORATION_OVERLINE;
}
if (NS_STYLE_TEXT_DECORATION_LINE_THROUGH & useDecorations) {
decorations.mStrikeColor = useOverride ? overrideColor : color;
decorMask &= ~NS_STYLE_TEXT_DECORATION_LINE_THROUGH;
decorations.mDecorations |= NS_STYLE_TEXT_DECORATION_LINE_THROUGH;
}
}
}
return decorations;
}
void
nsTextFrame::UnionTextDecorationOverflow(nsPresContext* aPresContext,
PropertyProvider& aProvider,
nsRect* aOverflowRect)
{
// Text-shadow overflows
nsRect shadowRect = nsLayoutUtils::GetTextShadowRectsUnion(*aOverflowRect, this);
aOverflowRect->UnionRect(*aOverflowRect, shadowRect);
if (IsFloatingFirstLetterChild()) {
// The underline/overline drawable area must be contained in the overflow
// rect when this is in floating first letter frame at *both* modes.
nscoord fontAscent, fontHeight;
nsIFontMetrics* fm = aProvider.GetFontMetrics();
fm->GetMaxAscent(fontAscent);
fm->GetMaxHeight(fontHeight);
nsRect fontRect(0, mAscent - fontAscent, GetSize().width, fontHeight);
aOverflowRect->UnionRect(*aOverflowRect, fontRect);
}
// When this frame is not selected, the text-decoration area must be in
// frame bounds.
float ratio;
if (!(GetStateBits() & NS_FRAME_SELECTED_CONTENT) ||
!HasSelectionOverflowingDecorations(aPresContext, &ratio))
return;
nsLineLayout::CombineTextDecorations(aPresContext,
NS_STYLE_TEXT_DECORATION_UNDERLINE,
this, *aOverflowRect, mAscent, ratio);
AddStateBits(TEXT_SELECTION_UNDERLINE_OVERFLOWED);
}
void
nsTextFrame::PaintTextDecorations(gfxContext* aCtx, const gfxRect& aDirtyRect,
const gfxPoint& aFramePt,
const gfxPoint& aTextBaselinePt,
nsTextPaintStyle& aTextPaintStyle,
PropertyProvider& aProvider,
const nscolor& aOverrideColor)
{
TextDecorations decorations =
GetTextDecorations(aTextPaintStyle.PresContext());
if (!decorations.HasDecorationlines())
return;
gfxFont* firstFont = aProvider.GetFontGroup()->GetFontAt(0);
if (!firstFont)
return; // OOM
const gfxFont::Metrics& fontMetrics = firstFont->GetMetrics();
gfxFloat app = aTextPaintStyle.PresContext()->AppUnitsPerDevPixel();
// XXX aFramePt is in AppUnits, shouldn't it be nsFloatPoint?
gfxPoint pt(aFramePt.x / app, (aTextBaselinePt.y - mAscent) / app);
gfxSize size(GetRect().width / app, 0);
gfxFloat ascent = gfxFloat(mAscent) / app;
nscolor lineColor;
if (decorations.HasOverline()) {
lineColor = aOverrideColor ? aOverrideColor : decorations.mOverColor;
size.height = fontMetrics.underlineSize;
nsCSSRendering::PaintDecorationLine(
aCtx, lineColor, pt, size, ascent, fontMetrics.maxAscent,
NS_STYLE_TEXT_DECORATION_OVERLINE, NS_STYLE_BORDER_STYLE_SOLID);
}
if (decorations.HasUnderline()) {
lineColor = aOverrideColor ? aOverrideColor : decorations.mUnderColor;
size.height = fontMetrics.underlineSize;
gfxFloat offset = aProvider.GetFontGroup()->GetUnderlineOffset();
nsCSSRendering::PaintDecorationLine(
aCtx, lineColor, pt, size, ascent, offset,
NS_STYLE_TEXT_DECORATION_UNDERLINE, NS_STYLE_BORDER_STYLE_SOLID);
}
if (decorations.HasStrikeout()) {
lineColor = aOverrideColor ? aOverrideColor : decorations.mStrikeColor;
size.height = fontMetrics.strikeoutSize;
gfxFloat offset = fontMetrics.strikeoutOffset;
nsCSSRendering::PaintDecorationLine(
aCtx, lineColor, pt, size, ascent, offset,
NS_STYLE_TEXT_DECORATION_LINE_THROUGH, NS_STYLE_BORDER_STYLE_SOLID);
}
}
// Make sure this stays in sync with DrawSelectionDecorations below
static const SelectionType SelectionTypesWithDecorations =
nsISelectionController::SELECTION_SPELLCHECK |
nsISelectionController::SELECTION_IME_RAWINPUT |
nsISelectionController::SELECTION_IME_SELECTEDRAWTEXT |
nsISelectionController::SELECTION_IME_CONVERTEDTEXT |
nsISelectionController::SELECTION_IME_SELECTEDCONVERTEDTEXT;
static void DrawIMEUnderline(gfxContext* aContext, PRInt32 aIndex,
nsTextPaintStyle& aTextPaintStyle, const gfxPoint& aPt, gfxFloat aWidth,
gfxFloat aAscent, gfxFloat aSize, gfxFloat aOffset)
{
nscolor color;
float relativeSize;
PRUint8 style;
if (!aTextPaintStyle.GetIMEUnderline(aIndex, &color, &relativeSize, &style))
return;
gfxFloat actualSize = relativeSize * aSize;
gfxFloat width = PR_MAX(0, aWidth - 2.0 * aSize);
gfxPoint pt(aPt.x + 1.0, aPt.y);
nsCSSRendering::PaintDecorationLine(
aContext, color, pt, gfxSize(width, actualSize), aAscent, aOffset,
NS_STYLE_TEXT_DECORATION_UNDERLINE, style);
}
/**
* This, plus SelectionTypesWithDecorations, encapsulates all knowledge about
* drawing text decoration for selections.
*/
static void DrawSelectionDecorations(gfxContext* aContext, SelectionType aType,
nsTextPaintStyle& aTextPaintStyle, const gfxPoint& aPt, gfxFloat aWidth,
gfxFloat aAscent, const gfxFont::Metrics& aFontMetrics)
{
gfxSize size(aWidth, aFontMetrics.underlineSize);
switch (aType) {
case nsISelectionController::SELECTION_SPELLCHECK: {
nsCSSRendering::PaintDecorationLine(
aContext, NS_RGB(255,0,0),
aPt, size, aAscent, aFontMetrics.underlineOffset,
NS_STYLE_TEXT_DECORATION_UNDERLINE, NS_STYLE_BORDER_STYLE_DOTTED);
break;
}
case nsISelectionController::SELECTION_IME_RAWINPUT:
DrawIMEUnderline(aContext, nsTextPaintStyle::eIndexRawInput,
aTextPaintStyle, aPt, aWidth, aAscent, size.height,
aFontMetrics.underlineOffset);
break;
case nsISelectionController::SELECTION_IME_SELECTEDRAWTEXT:
DrawIMEUnderline(aContext, nsTextPaintStyle::eIndexSelRawText,
aTextPaintStyle, aPt, aWidth, aAscent, size.height,
aFontMetrics.underlineOffset);
break;
case nsISelectionController::SELECTION_IME_CONVERTEDTEXT:
DrawIMEUnderline(aContext, nsTextPaintStyle::eIndexConvText,
aTextPaintStyle, aPt, aWidth, aAscent, size.height,
aFontMetrics.underlineOffset);
break;
case nsISelectionController::SELECTION_IME_SELECTEDCONVERTEDTEXT:
DrawIMEUnderline(aContext, nsTextPaintStyle::eIndexSelConvText,
aTextPaintStyle, aPt, aWidth, aAscent, size.height,
aFontMetrics.underlineOffset);
break;
default:
NS_WARNING("Requested selection decorations when there aren't any");
break;
}
}
/**
* This function encapsulates all knowledge of how selections affect foreground
* and background colors.
* @return true if the selection affects colors, false otherwise
* @param aForeground the foreground color to use
* @param aBackground the background color to use, or RGBA(0,0,0,0) if no
* background should be painted
*/
static PRBool GetSelectionTextColors(SelectionType aType, nsTextPaintStyle& aTextPaintStyle,
nscolor* aForeground, nscolor* aBackground)
{
switch (aType) {
case nsISelectionController::SELECTION_NORMAL:
return aTextPaintStyle.GetSelectionColors(aForeground, aBackground);
case nsISelectionController::SELECTION_FIND:
aTextPaintStyle.GetHighlightColors(aForeground, aBackground);
return PR_TRUE;
case nsISelectionController::SELECTION_IME_RAWINPUT:
aTextPaintStyle.GetIMESelectionColors(nsTextPaintStyle::eIndexRawInput,
aForeground, aBackground);
return PR_TRUE;
case nsISelectionController::SELECTION_IME_SELECTEDRAWTEXT:
aTextPaintStyle.GetIMESelectionColors(nsTextPaintStyle::eIndexSelRawText,
aForeground, aBackground);
return PR_TRUE;
case nsISelectionController::SELECTION_IME_CONVERTEDTEXT:
aTextPaintStyle.GetIMESelectionColors(nsTextPaintStyle::eIndexConvText,
aForeground, aBackground);
return PR_TRUE;
case nsISelectionController::SELECTION_IME_SELECTEDCONVERTEDTEXT:
aTextPaintStyle.GetIMESelectionColors(nsTextPaintStyle::eIndexSelConvText,
aForeground, aBackground);
return PR_TRUE;
default:
*aForeground = aTextPaintStyle.GetTextColor();
*aBackground = NS_RGBA(0,0,0,0);
return PR_FALSE;
}
}
/**
* This class lets us iterate over chunks of text in a uniform selection state,
* observing cluster boundaries, in content order, maintaining the current
* x-offset as we go, and telling whether the text chunk has a hyphen after
* it or not. The caller is responsible for actually computing the advance
* width of each chunk.
*/
class SelectionIterator {
public:
/**
* aStart and aLength are in the original string. aSelectionBuffer is
* according to the original string.
*/
SelectionIterator(SelectionType* aSelectionBuffer, PRInt32 aStart,
PRInt32 aLength, PropertyProvider& aProvider,
gfxTextRun* aTextRun);
/**
* Returns the next segment of uniformly selected (or not) text.
* @param aXOffset the offset from the origin of the frame to the start
* of the text (the left baseline origin for LTR, the right baseline origin
* for RTL)
* @param aOffset the transformed string offset of the text for this segment
* @param aLength the transformed string length of the text for this segment
* @param aHyphenWidth if a hyphen is to be rendered after the text, the
* width of the hyphen, otherwise zero
* @param aType the selection type for this segment
* @return false if there are no more segments
*/
PRBool GetNextSegment(gfxFloat* aXOffset, PRUint32* aOffset, PRUint32* aLength,
gfxFloat* aHyphenWidth, SelectionType* aType);
void UpdateWithAdvance(gfxFloat aAdvance) {
mXOffset += aAdvance*mTextRun->GetDirection();
}
private:
SelectionType* mSelectionBuffer;
PropertyProvider& mProvider;
gfxTextRun* mTextRun;
gfxSkipCharsIterator mIterator;
PRInt32 mOriginalStart;
PRInt32 mOriginalEnd;
gfxFloat mXOffset;
};
SelectionIterator::SelectionIterator(SelectionType* aSelectionBuffer,
PRInt32 aStart, PRInt32 aLength, PropertyProvider& aProvider,
gfxTextRun* aTextRun)
: mSelectionBuffer(aSelectionBuffer), mProvider(aProvider),
mTextRun(aTextRun), mIterator(aProvider.GetStart()),
mOriginalStart(aStart), mOriginalEnd(aStart + aLength),
mXOffset(mTextRun->IsRightToLeft() ? aProvider.GetFrame()->GetSize().width : 0)
{
mIterator.SetOriginalOffset(aStart);
}
PRBool SelectionIterator::GetNextSegment(gfxFloat* aXOffset,
PRUint32* aOffset, PRUint32* aLength, gfxFloat* aHyphenWidth, SelectionType* aType)
{
if (mIterator.GetOriginalOffset() >= mOriginalEnd)
return PR_FALSE;
// save offset into transformed string now
PRUint32 runOffset = mIterator.GetSkippedOffset();
PRInt32 index = mIterator.GetOriginalOffset() - mOriginalStart;
SelectionType type = mSelectionBuffer[index];
for (++index; mOriginalStart + index < mOriginalEnd; ++index) {
if (mSelectionBuffer[index] != type)
break;
}
mIterator.SetOriginalOffset(index + mOriginalStart);
// Advance to the next cluster boundary
while (mIterator.GetOriginalOffset() < mOriginalEnd &&
!mIterator.IsOriginalCharSkipped() &&
!mTextRun->IsClusterStart(mIterator.GetSkippedOffset())) {
mIterator.AdvanceOriginal(1);
}
PRBool haveHyphenBreak =
(mProvider.GetFrame()->GetStateBits() & TEXT_HYPHEN_BREAK) != 0;
*aOffset = runOffset;
*aLength = mIterator.GetSkippedOffset() - runOffset;
*aXOffset = mXOffset;
*aHyphenWidth = 0;
if (mIterator.GetOriginalOffset() == mOriginalEnd && haveHyphenBreak) {
*aHyphenWidth = mProvider.GetHyphenWidth();
}
*aType = type;
return PR_TRUE;
}
void
nsTextFrame::PaintOneShadow(PRUint32 aOffset, PRUint32 aLength,
nsCSSShadowItem* aShadowDetails,
PropertyProvider* aProvider, const gfxRect& aDirtyRect,
const gfxPoint& aFramePt, const gfxPoint& aTextBaselinePt,
gfxContext* aCtx, const nscolor& aForegroundColor)
{
nscoord xOffset = aShadowDetails->mXOffset.GetCoordValue();
nscoord yOffset = aShadowDetails->mYOffset.GetCoordValue();
nscoord blurRadius = PR_MAX(aShadowDetails->mRadius.GetCoordValue(), 0);
nsTextPaintStyle textPaintStyle(this);
gfxFloat advanceWidth;
gfxTextRun::Metrics shadowMetrics =
mTextRun->MeasureText(aOffset, aLength, PR_FALSE,
nsnull, aProvider);
// This rect is the box which is equivalent to where the shadow will be painted.
// X and Y are significant because they can affect the rounding.
// The origin of mBoundingBox is the text baseline point, so we must translate it by
// that much in order to make the origin the top-left corner of the text bounding box.
gfxRect shadowRect = shadowMetrics.mBoundingBox + aTextBaselinePt;
shadowRect.MoveBy(gfxPoint(xOffset, yOffset));
if (GetStateBits() & TEXT_HYPHEN_BREAK) {
// Add the width of the soft hyphen so it isn't cut off
shadowRect.size.width += aProvider->GetHyphenWidth();
}
nsContextBoxBlur contextBoxBlur;
gfxContext* shadowContext = contextBoxBlur.Init(shadowRect, blurRadius,
PresContext()->AppUnitsPerDevPixel(),
aCtx);
if (!shadowContext)
return;
nscolor shadowColor;
if (aShadowDetails->mHasColor)
shadowColor = aShadowDetails->mColor;
else
shadowColor = aForegroundColor;
aCtx->Save();
aCtx->NewPath();
aCtx->SetColor(gfxRGBA(shadowColor));
// Draw the text onto our alpha-only surface to capture the alpha values.
// Remember that the box blur context has a device offset on it, so we don't need to
// translate any coordinates to fit on the surface.
DrawText(shadowContext,
aTextBaselinePt + gfxPoint(xOffset, yOffset),
aOffset, aLength, &aDirtyRect, aProvider, advanceWidth,
(GetStateBits() & TEXT_HYPHEN_BREAK) != 0);
// This will only have an effect in quirks mode. Standards mode text-decoration shadow painting
// is handled in nsHTMLContainerFrame.cpp, so you must remember to consider that if you change
// any code behaviour here.
PaintTextDecorations(shadowContext, aDirtyRect, aFramePt + gfxPoint(xOffset, yOffset),
aTextBaselinePt + gfxPoint(xOffset, yOffset),
textPaintStyle, *aProvider, shadowColor);
contextBoxBlur.DoPaint();
aCtx->Restore();
}
// Paints selection backgrounds and text in the correct colors. Also computes
// aAllTypes, the union of all selection types that are applying to this text.
void
nsTextFrame::PaintTextWithSelectionColors(gfxContext* aCtx,
const gfxPoint& aFramePt,
const gfxPoint& aTextBaselinePt, const gfxRect& aDirtyRect,
PropertyProvider& aProvider, nsTextPaintStyle& aTextPaintStyle,
SelectionDetails* aDetails, SelectionType* aAllTypes)
{
PRInt32 contentOffset = aProvider.GetStart().GetOriginalOffset();
PRInt32 contentLength = aProvider.GetOriginalLength();
// Figure out which selections control the colors to use for each character.
nsAutoTArray<SelectionType,BIG_TEXT_NODE_SIZE> prevailingSelectionsBuffer;
if (!prevailingSelectionsBuffer.AppendElements(contentLength))
return;
SelectionType* prevailingSelections = prevailingSelectionsBuffer.Elements();
PRInt32 i;
SelectionType allTypes = 0;
for (i = 0; i < contentLength; ++i) {
prevailingSelections[i] = nsISelectionController::SELECTION_NONE;
}
SelectionDetails *sdptr = aDetails;
PRBool anyBackgrounds = PR_FALSE;
while (sdptr) {
PRInt32 start = PR_MAX(0, sdptr->mStart - contentOffset);
PRInt32 end = PR_MIN(contentLength, sdptr->mEnd - contentOffset);
SelectionType type = sdptr->mType;
if (start < end) {
allTypes |= type;
// Ignore selections that don't set colors
nscolor foreground, background;
if (GetSelectionTextColors(type, aTextPaintStyle, &foreground, &background)) {
if (NS_GET_A(background) > 0) {
anyBackgrounds = PR_TRUE;
}
for (i = start; i < end; ++i) {
PRInt16 currentPrevailingSelection = prevailingSelections[i];
// Favour normal selection over IME selections
if (currentPrevailingSelection == nsISelectionController::SELECTION_NONE ||
type < currentPrevailingSelection) {
prevailingSelections[i] = type;
}
}
}
}
sdptr = sdptr->mNext;
}
*aAllTypes = allTypes;
gfxFloat xOffset, hyphenWidth;
PRUint32 offset, length; // in transformed string
SelectionType type;
// Draw background colors
if (anyBackgrounds) {
SelectionIterator iterator(prevailingSelections, contentOffset, contentLength,
aProvider, mTextRun);
while (iterator.GetNextSegment(&xOffset, &offset, &length, &hyphenWidth, &type)) {
nscolor foreground, background;
GetSelectionTextColors(type, aTextPaintStyle, &foreground, &background);
// Draw background color
gfxFloat advance = hyphenWidth +
mTextRun->GetAdvanceWidth(offset, length, &aProvider);
if (NS_GET_A(background) > 0) {
gfxFloat x = xOffset - (mTextRun->IsRightToLeft() ? advance : 0);
FillClippedRect(aCtx, aTextPaintStyle.PresContext(),
background, aDirtyRect,
gfxRect(aFramePt.x + x, aFramePt.y, advance, GetSize().height));
}
iterator.UpdateWithAdvance(advance);
}
}
// Draw text
SelectionIterator iterator(prevailingSelections, contentOffset, contentLength,
aProvider, mTextRun);
while (iterator.GetNextSegment(&xOffset, &offset, &length, &hyphenWidth, &type)) {
nscolor foreground, background;
GetSelectionTextColors(type, aTextPaintStyle, &foreground, &background);
// Draw text segment
aCtx->SetColor(gfxRGBA(foreground));
gfxFloat advance;
DrawText(aCtx, gfxPoint(aFramePt.x + xOffset, aTextBaselinePt.y),
offset, length, &aDirtyRect, &aProvider,
advance, hyphenWidth > 0);
if (hyphenWidth) {
advance += hyphenWidth;
}
iterator.UpdateWithAdvance(advance);
}
}
void
nsTextFrame::PaintTextSelectionDecorations(gfxContext* aCtx,
const gfxPoint& aFramePt,
const gfxPoint& aTextBaselinePt, const gfxRect& aDirtyRect,
PropertyProvider& aProvider, nsTextPaintStyle& aTextPaintStyle,
SelectionDetails* aDetails, SelectionType aSelectionType)
{
PRInt32 contentOffset = aProvider.GetStart().GetOriginalOffset();
PRInt32 contentLength = aProvider.GetOriginalLength();
// Figure out which characters will be decorated for this selection. Here
// we just fill the buffer with either SELECTION_NONE or aSelectionType.
nsAutoTArray<SelectionType,BIG_TEXT_NODE_SIZE> selectedCharsBuffer;
if (!selectedCharsBuffer.AppendElements(contentLength))
return;
SelectionType* selectedChars = selectedCharsBuffer.Elements();
PRInt32 i;
for (i = 0; i < contentLength; ++i) {
selectedChars[i] = nsISelectionController::SELECTION_NONE;
}
SelectionDetails *sdptr = aDetails;
while (sdptr) {
if (sdptr->mType == aSelectionType) {
PRInt32 start = PR_MAX(0, sdptr->mStart - contentOffset);
PRInt32 end = PR_MIN(contentLength, sdptr->mEnd - contentOffset);
for (i = start; i < end; ++i) {
selectedChars[i] = aSelectionType;
}
}
sdptr = sdptr->mNext;
}
gfxFont* firstFont = aProvider.GetFontGroup()->GetFontAt(0);
if (!firstFont)
return; // OOM
gfxFont::Metrics decorationMetrics(firstFont->GetMetrics());
decorationMetrics.underlineOffset =
aProvider.GetFontGroup()->GetUnderlineOffset();
SelectionIterator iterator(selectedChars, contentOffset, contentLength,
aProvider, mTextRun);
gfxFloat xOffset, hyphenWidth;
PRUint32 offset, length;
PRInt32 app = aTextPaintStyle.PresContext()->AppUnitsPerDevPixel();
// XXX aTextBaselinePt is in AppUnits, shouldn't it be nsFloatPoint?
gfxPoint pt(0.0, (aTextBaselinePt.y - mAscent) / app);
SelectionType type;
while (iterator.GetNextSegment(&xOffset, &offset, &length, &hyphenWidth, &type)) {
gfxFloat advance = hyphenWidth +
mTextRun->GetAdvanceWidth(offset, length, &aProvider);
if (type == aSelectionType) {
pt.x = (aFramePt.x + xOffset -
(mTextRun->IsRightToLeft() ? advance : 0)) / app;
gfxFloat width = PR_ABS(advance) / app;
DrawSelectionDecorations(aCtx, aSelectionType, aTextPaintStyle,
pt, width, mAscent / app, decorationMetrics);
}
iterator.UpdateWithAdvance(advance);
}
}
PRBool
nsTextFrame::PaintTextWithSelection(gfxContext* aCtx,
const gfxPoint& aFramePt,
const gfxPoint& aTextBaselinePt, const gfxRect& aDirtyRect,
PropertyProvider& aProvider, nsTextPaintStyle& aTextPaintStyle)
{
SelectionDetails* details = GetSelectionDetails();
if (!details)
return PR_FALSE;
SelectionType allTypes;
PaintTextWithSelectionColors(aCtx, aFramePt, aTextBaselinePt, aDirtyRect,
aProvider, aTextPaintStyle, details, &allTypes);
PaintTextDecorations(aCtx, aDirtyRect, aFramePt, aTextBaselinePt,
aTextPaintStyle, aProvider);
PRInt32 i;
// Iterate through just the selection types that paint decorations and
// paint decorations for any that actually occur in this frame. Paint
// higher-numbered selection types below lower-numered ones on the
// general principal that lower-numbered selections are higher priority.
allTypes &= SelectionTypesWithDecorations;
for (i = nsISelectionController::NUM_SELECTIONTYPES - 1; i >= 1; --i) {
SelectionType type = 1 << (i - 1);
if (allTypes & type) {
// There is some selection of this type. Try to paint its decorations
// (there might not be any for this type but that's OK,
// PaintTextSelectionDecorations will exit early).
PaintTextSelectionDecorations(aCtx, aFramePt, aTextBaselinePt, aDirtyRect,
aProvider, aTextPaintStyle, details, type);
}
}
DestroySelectionDetails(details);
return PR_TRUE;
}
static PRUint32
ComputeTransformedLength(PropertyProvider& aProvider)
{
gfxSkipCharsIterator iter(aProvider.GetStart());
PRUint32 start = iter.GetSkippedOffset();
iter.AdvanceOriginal(aProvider.GetOriginalLength());
return iter.GetSkippedOffset() - start;
}
gfxFloat
nsTextFrame::GetSnappedBaselineY(gfxContext* aContext, gfxFloat aY)
{
gfxFloat appUnitsPerDevUnit = mTextRun->GetAppUnitsPerDevUnit();
gfxFloat baseline = aY + mAscent;
gfxRect putativeRect(0, baseline/appUnitsPerDevUnit, 1, 1);
if (!aContext->UserToDevicePixelSnapped(putativeRect))
return baseline;
return aContext->DeviceToUser(putativeRect.pos).y*appUnitsPerDevUnit;
}
void
nsTextFrame::PaintText(nsIRenderingContext* aRenderingContext, nsPoint aPt,
const nsRect& aDirtyRect)
{
// Don't pass in aRenderingContext here, because we need a *reference*
// context and aRenderingContext might have some transform in it
// XXX get the block and line passed to us somehow! This is slow!
gfxSkipCharsIterator iter = EnsureTextRun();
if (!mTextRun)
return;
nsTextPaintStyle textPaintStyle(this);
PropertyProvider provider(this, iter);
// Trim trailing whitespace
provider.InitializeForDisplay(PR_TRUE);
gfxContext* ctx = aRenderingContext->ThebesContext();
gfxPoint framePt(aPt.x, aPt.y);
gfxPoint textBaselinePt(
mTextRun->IsRightToLeft() ? gfxFloat(aPt.x + GetSize().width) : framePt.x,
GetSnappedBaselineY(ctx, aPt.y));
gfxRect dirtyRect(aDirtyRect.x, aDirtyRect.y,
aDirtyRect.width, aDirtyRect.height);
gfxFloat advanceWidth;
gfxRGBA foregroundColor = gfxRGBA(textPaintStyle.GetTextColor());
// Paint the text shadow before doing any foreground stuff
const nsStyleText* textStyle = GetStyleText();
if (textStyle->mTextShadow) {
// Text shadow happens with the last value being painted at the back,
// ie. it is painted first.
for (PRUint32 i = textStyle->mTextShadow->Length(); i > 0; --i) {
PaintOneShadow(provider.GetStart().GetSkippedOffset(),
ComputeTransformedLength(provider),
textStyle->mTextShadow->ShadowAt(i - 1), &provider,
dirtyRect, framePt, textBaselinePt, ctx,
textPaintStyle.GetTextColor());
}
}
// Fork off to the (slower) paint-with-selection path if necessary.
if (GetNonGeneratedAncestor(this)->GetStateBits() & NS_FRAME_SELECTED_CONTENT) {
if (PaintTextWithSelection(ctx, framePt, textBaselinePt,
dirtyRect, provider, textPaintStyle))
return;
}
ctx->SetColor(foregroundColor);
DrawText(ctx, textBaselinePt, provider.GetStart().GetSkippedOffset(),
ComputeTransformedLength(provider), &dirtyRect,
&provider, advanceWidth,
(GetStateBits() & TEXT_HYPHEN_BREAK) != 0);
PaintTextDecorations(ctx, dirtyRect, framePt, textBaselinePt,
textPaintStyle, provider);
}
void
nsTextFrame::DrawText(gfxContext* aCtx, const gfxPoint& aTextBaselinePt,
PRUint32 aOffset, PRUint32 aLength,
const gfxRect* aDirtyRect, PropertyProvider* aProvider,
gfxFloat& aAdvanceWidth, PRBool aDrawSoftHyphen)
{
// Paint the text and soft-hyphen (if any) onto the given graphics context
mTextRun->Draw(aCtx, aTextBaselinePt, aOffset, aLength,
aDirtyRect, aProvider, &aAdvanceWidth);
if (aDrawSoftHyphen) {
// Don't use ctx as the context, because we need a reference context here,
// ctx may be transformed.
gfxTextRunCache::AutoTextRun hyphenTextRun(GetHyphenTextRun(mTextRun, nsnull, this));
if (hyphenTextRun.get()) {
// For right-to-left text runs, the soft-hyphen is positioned at the left
// of the text, minus its own width
gfxFloat hyphenBaselineX = aTextBaselinePt.x + mTextRun->GetDirection() * aAdvanceWidth -
(mTextRun->IsRightToLeft() ? hyphenTextRun->GetAdvanceWidth(0, hyphenTextRun->GetLength(), nsnull) : 0);
hyphenTextRun->Draw(aCtx, gfxPoint(hyphenBaselineX, aTextBaselinePt.y),
0, hyphenTextRun->GetLength(), aDirtyRect, nsnull, nsnull);
}
}
}
PRInt16
nsTextFrame::GetSelectionStatus(PRInt16* aSelectionFlags)
{
// get the selection controller
nsCOMPtr<nsISelectionController> selectionController;
nsresult rv = GetSelectionController(PresContext(),
getter_AddRefs(selectionController));
if (NS_FAILED(rv) || !selectionController)
return nsISelectionController::SELECTION_OFF;
selectionController->GetSelectionFlags(aSelectionFlags);
PRInt16 selectionValue;
selectionController->GetDisplaySelection(&selectionValue);
return selectionValue;
}
PRBool
nsTextFrame::IsVisibleInSelection(nsISelection* aSelection)
{
// Check the quick way first
PRBool isSelected = (mState & NS_FRAME_SELECTED_CONTENT) == NS_FRAME_SELECTED_CONTENT;
if (!isSelected)
return PR_FALSE;
SelectionDetails* details = GetSelectionDetails();
PRBool found = PR_FALSE;
// where are the selection points "really"
SelectionDetails *sdptr = details;
while (sdptr) {
if (sdptr->mEnd > GetContentOffset() &&
sdptr->mStart < GetContentEnd() &&
sdptr->mType == nsISelectionController::SELECTION_NORMAL) {
found = PR_TRUE;
break;
}
sdptr = sdptr->mNext;
}
DestroySelectionDetails(details);
return found;
}
/**
* Compute the longest prefix of text whose width is <= aWidth. Return
* the length of the prefix. Also returns the width of the prefix in aFitWidth.
*/
static PRUint32
CountCharsFit(gfxTextRun* aTextRun, PRUint32 aStart, PRUint32 aLength,
gfxFloat aWidth, PropertyProvider* aProvider,
gfxFloat* aFitWidth)
{
PRUint32 last = 0;
gfxFloat width = 0;
PRUint32 i;
for (i = 1; i <= aLength; ++i) {
if (i == aLength || aTextRun->IsClusterStart(aStart + i)) {
gfxFloat nextWidth = width +
aTextRun->GetAdvanceWidth(aStart + last, i - last, aProvider);
if (nextWidth > aWidth)
break;
last = i;
width = nextWidth;
}
}
*aFitWidth = width;
return last;
}
nsIFrame::ContentOffsets
nsTextFrame::CalcContentOffsetsFromFramePoint(nsPoint aPoint) {
ContentOffsets offsets;
gfxSkipCharsIterator iter = EnsureTextRun();
if (!mTextRun)
return offsets;
PropertyProvider provider(this, iter);
// Trim leading but not trailing whitespace if possible
provider.InitializeForDisplay(PR_FALSE);
gfxFloat width = mTextRun->IsRightToLeft() ? mRect.width - aPoint.x : aPoint.x;
gfxFloat fitWidth;
PRUint32 skippedLength = ComputeTransformedLength(provider);
PRUint32 charsFit = CountCharsFit(mTextRun,
provider.GetStart().GetSkippedOffset(), skippedLength, width, &provider, &fitWidth);
PRInt32 selectedOffset;
if (charsFit < skippedLength) {
// charsFit characters fitted, but no more could fit. See if we're
// more than halfway through the cluster.. If we are, choose the next
// cluster.
gfxSkipCharsIterator extraCluster(provider.GetStart());
extraCluster.AdvanceSkipped(charsFit);
gfxSkipCharsIterator extraClusterLastChar(extraCluster);
FindClusterEnd(mTextRun,
provider.GetStart().GetOriginalOffset() + provider.GetOriginalLength(),
&extraClusterLastChar);
gfxFloat charWidth =
mTextRun->GetAdvanceWidth(extraCluster.GetSkippedOffset(),
GetSkippedDistance(extraCluster, extraClusterLastChar) + 1,
&provider);
selectedOffset = width <= fitWidth + charWidth/2
? extraCluster.GetOriginalOffset()
: extraClusterLastChar.GetOriginalOffset() + 1;
} else {
// All characters fitted, we're at (or beyond) the end of the text.
// XXX This could be some pathological situation where negative spacing
// caused characters to move backwards. We can't really handle that
// in the current frame system because frames can't have negative
// intrinsic widths.
selectedOffset =
provider.GetStart().GetOriginalOffset() + provider.GetOriginalLength();
}
offsets.content = GetContent();
offsets.offset = offsets.secondaryOffset = selectedOffset;
offsets.associateWithNext = mContentOffset == offsets.offset;
return offsets;
}
PRBool
nsTextFrame::HasSelectionOverflowingDecorations(nsPresContext* aPresContext,
float* aRatio)
{
float ratio;
nsILookAndFeel* look = aPresContext->LookAndFeel();
look->GetMetric(nsILookAndFeel::eMetricFloat_IMEUnderlineRelativeSize, ratio);
if (aRatio)
*aRatio = ratio;
if (ratio <= 1.0f)
return PR_FALSE;
SelectionDetails *details = GetSelectionDetails();
PRBool retval = PR_FALSE;
for (SelectionDetails *sd = details; sd; sd = sd->mNext) {
if (sd->mStart != sd->mEnd &&
sd->mType & SelectionTypesWithDecorations) {
retval = PR_TRUE;
break;
}
}
DestroySelectionDetails(details);
return retval;
}
//null range means the whole thing
NS_IMETHODIMP
nsTextFrame::SetSelected(nsPresContext* aPresContext,
nsIDOMRange *aRange,
PRBool aSelected,
nsSpread aSpread)
{
DEBUG_VERIFY_NOT_DIRTY(mState);
#if 0 //XXXrbs disable due to bug 310318
if (mState & NS_FRAME_IS_DIRTY)
return NS_ERROR_UNEXPECTED;
#endif
if (aSelected && ParentDisablesSelection())
return NS_OK;
// check whether style allows selection
PRBool selectable;
IsSelectable(&selectable, nsnull);
if (!selectable)
return NS_OK;//do not continue no selection for this frame.
PRBool found = PR_FALSE;
if (aRange) {
//lets see if the range contains us, if so we must redraw!
nsCOMPtr<nsIDOMNode> endNode;
PRInt32 endOffset;
nsCOMPtr<nsIDOMNode> startNode;
PRInt32 startOffset;
aRange->GetEndContainer(getter_AddRefs(endNode));
aRange->GetEndOffset(&endOffset);
aRange->GetStartContainer(getter_AddRefs(startNode));
aRange->GetStartOffset(&startOffset);
nsCOMPtr<nsIDOMNode> thisNode = do_QueryInterface(GetContent());
if (thisNode == startNode)
{
if (GetContentEnd() >= startOffset)
{
found = PR_TRUE;
if (thisNode == endNode)
{ //special case
if (endOffset == startOffset) //no need to redraw since drawing takes place with cursor
found = PR_FALSE;
if (mContentOffset > endOffset)
found = PR_FALSE;
}
}
}
else if (thisNode == endNode)
{
if (mContentOffset < endOffset)
found = PR_TRUE;
else
{
found = PR_FALSE;
}
}
else
{
found = PR_TRUE;
}
}
else {
// null range means the whole thing
found = PR_TRUE;
}
if ( aSelected )
AddStateBits(NS_FRAME_SELECTED_CONTENT);
else
{ //we need to see if any other selection is available.
SelectionDetails *details = GetSelectionDetails();
if (!details) {
RemoveStateBits(NS_FRAME_SELECTED_CONTENT);
} else {
DestroySelectionDetails(details);
}
}
if (found) {
// If the selection state is changed in this content, we need to reflow
// to recompute the overflow area for underline of spellchecking or IME if
// their underline is thicker than normal decoration line.
PRBool didHaveSelectionUnderline =
!!(mState & TEXT_SELECTION_UNDERLINE_OVERFLOWED);
PRBool willHaveSelectionUnderline =
aSelected && HasSelectionOverflowingDecorations(PresContext());
if (didHaveSelectionUnderline != willHaveSelectionUnderline) {
PresContext()->PresShell()->FrameNeedsReflow(this,
nsIPresShell::eStyleChange,
NS_FRAME_IS_DIRTY);
}
// Selection might change anything. Invalidate the overflow area.
Invalidate(GetOverflowRect(), PR_FALSE);
}
if (aSpread == eSpreadDown)
{
nsIFrame* frame = GetPrevContinuation();
while(frame){
frame->SetSelected(aPresContext, aRange,aSelected,eSpreadNone);
frame = frame->GetPrevContinuation();
}
frame = GetNextContinuation();
while (frame){
frame->SetSelected(aPresContext, aRange,aSelected,eSpreadNone);
frame = frame->GetNextContinuation();
}
}
return NS_OK;
}
NS_IMETHODIMP
nsTextFrame::GetPointFromOffset(PRInt32 inOffset,
nsPoint* outPoint)
{
if (!outPoint)
return NS_ERROR_NULL_POINTER;
outPoint->x = 0;
outPoint->y = 0;
DEBUG_VERIFY_NOT_DIRTY(mState);
if (mState & NS_FRAME_IS_DIRTY)
return NS_ERROR_UNEXPECTED;
if (GetContentLength() <= 0) {
return NS_OK;
}
gfxSkipCharsIterator iter = EnsureTextRun();
if (!mTextRun)
return NS_ERROR_FAILURE;
PropertyProvider properties(this, iter);
// Don't trim trailing whitespace, we want the caret to appear in the right
// place if it's positioned there
properties.InitializeForDisplay(PR_FALSE);
if (inOffset < GetContentOffset()){
NS_WARNING("offset before this frame's content");
inOffset = GetContentOffset();
} else if (inOffset > GetContentEnd()) {
NS_WARNING("offset after this frame's content");
inOffset = GetContentEnd();
}
PRInt32 trimmedOffset = properties.GetStart().GetOriginalOffset();
PRInt32 trimmedEnd = trimmedOffset + properties.GetOriginalLength();
inOffset = PR_MAX(inOffset, trimmedOffset);
inOffset = PR_MIN(inOffset, trimmedEnd);
iter.SetOriginalOffset(inOffset);
if (inOffset < trimmedEnd &&
!iter.IsOriginalCharSkipped() &&
!mTextRun->IsClusterStart(iter.GetSkippedOffset())) {
NS_WARNING("GetPointFromOffset called for non-cluster boundary");
FindClusterStart(mTextRun, &iter);
}
gfxFloat advanceWidth =
mTextRun->GetAdvanceWidth(properties.GetStart().GetSkippedOffset(),
GetSkippedDistance(properties.GetStart(), iter),
&properties);
nscoord width = NSToCoordCeil(advanceWidth);
if (mTextRun->IsRightToLeft()) {
outPoint->x = mRect.width - width;
} else {
outPoint->x = width;
}
outPoint->y = 0;
return NS_OK;
}
NS_IMETHODIMP
nsTextFrame::GetChildFrameContainingOffset(PRInt32 aContentOffset,
PRBool aHint,
PRInt32* aOutOffset,
nsIFrame**aOutFrame)
{
DEBUG_VERIFY_NOT_DIRTY(mState);
#if 0 //XXXrbs disable due to bug 310227
if (mState & NS_FRAME_IS_DIRTY)
return NS_ERROR_UNEXPECTED;
#endif
NS_ASSERTION(aOutOffset && aOutFrame, "Bad out parameters");
NS_ASSERTION(aContentOffset >= 0, "Negative content offset, existing code was very broken!");
nsTextFrame* f = this;
if (aContentOffset >= mContentOffset) {
while (PR_TRUE) {
nsTextFrame* next = static_cast<nsTextFrame*>(f->GetNextContinuation());
if (!next || aContentOffset < next->GetContentOffset())
break;
if (aContentOffset == next->GetContentOffset()) {
if (aHint) {
f = next;
}
break;
}
f = next;
}
} else {
while (PR_TRUE) {
nsTextFrame* prev = static_cast<nsTextFrame*>(f->GetPrevContinuation());
if (!prev || aContentOffset > f->GetContentOffset())
break;
if (aContentOffset == f->GetContentOffset()) {
if (!aHint) {
f = prev;
}
break;
}
f = prev;
}
}
*aOutOffset = aContentOffset - f->GetContentOffset();
*aOutFrame = f;
return NS_OK;
}
PRBool
nsTextFrame::PeekOffsetNoAmount(PRBool aForward, PRInt32* aOffset)
{
NS_ASSERTION(aOffset && *aOffset <= GetContentLength(), "aOffset out of range");
gfxSkipCharsIterator iter = EnsureTextRun();
if (!mTextRun)
return PR_FALSE;
TrimmedOffsets trimmed = GetTrimmedOffsets(mContent->GetText(), PR_TRUE);
// Check whether there are nonskipped characters in the trimmmed range
return iter.ConvertOriginalToSkipped(trimmed.GetEnd()) >
iter.ConvertOriginalToSkipped(trimmed.mStart);
}
/**
* This class iterates through the clusters before or after the given
* aPosition (which is a content offset). You can test each cluster
* to see if it's whitespace (as far as selection/caret movement is concerned),
* or punctuation, or if there is a word break before the cluster. ("Before"
* is interpreted according to aDirection, so if aDirection is -1, "before"
* means actually *after* the cluster content.)
*/
class NS_STACK_CLASS ClusterIterator {
public:
ClusterIterator(nsTextFrame* aTextFrame, PRInt32 aPosition, PRInt32 aDirection,
nsString& aContext);
PRBool NextCluster();
PRBool IsWhitespace();
PRBool IsPunctuation();
PRBool HaveWordBreakBefore() { return mHaveWordBreak; }
PRInt32 GetAfterOffset();
PRInt32 GetBeforeOffset();
private:
nsCOMPtr<nsIUGenCategory> mCategories;
gfxSkipCharsIterator mIterator;
const nsTextFragment* mFrag;
nsTextFrame* mTextFrame;
PRInt32 mDirection;
PRInt32 mCharIndex;
nsTextFrame::TrimmedOffsets mTrimmed;
nsTArray<PRPackedBool> mWordBreaks;
PRPackedBool mHaveWordBreak;
};
static PRBool
IsAcceptableCaretPosition(const gfxSkipCharsIterator& aIter, gfxTextRun* aTextRun,
nsIFrame* aFrame)
{
if (aIter.IsOriginalCharSkipped())
return PR_FALSE;
PRUint32 index = aIter.GetSkippedOffset();
if (!aTextRun->IsClusterStart(index))
return PR_FALSE;
return !(aFrame->GetStyleText()->WhiteSpaceIsSignificant() &&
aTextRun->GetChar(index) == '\n');
}
PRBool
nsTextFrame::PeekOffsetCharacter(PRBool aForward, PRInt32* aOffset)
{
PRInt32 contentLength = GetContentLength();
NS_ASSERTION(aOffset && *aOffset <= contentLength, "aOffset out of range");
PRBool selectable;
PRUint8 selectStyle;
IsSelectable(&selectable, &selectStyle);
if (selectStyle == NS_STYLE_USER_SELECT_ALL)
return PR_FALSE;
gfxSkipCharsIterator iter = EnsureTextRun();
if (!mTextRun)
return PR_FALSE;
TrimmedOffsets trimmed = GetTrimmedOffsets(mContent->GetText(), PR_FALSE);
// A negative offset means "end of frame".
PRInt32 startOffset = GetContentOffset() + (*aOffset < 0 ? contentLength : *aOffset);
if (!aForward) {
PRInt32 i;
for (i = PR_MIN(trimmed.GetEnd(), startOffset) - 1;
i >= trimmed.mStart; --i) {
iter.SetOriginalOffset(i);
if (IsAcceptableCaretPosition(iter, mTextRun, this)) {
*aOffset = i - mContentOffset;
return PR_TRUE;
}
}
*aOffset = 0;
} else {
PRInt32 i;
for (i = startOffset + 1; i <= trimmed.GetEnd(); ++i) {
iter.SetOriginalOffset(i);
// XXX we can't necessarily stop at the end of this frame,
// but we really have no choice right now. We need to do a deeper
// fix/restructuring of PeekOffsetCharacter
if (i == trimmed.GetEnd() ||
IsAcceptableCaretPosition(iter, mTextRun, this)) {
*aOffset = i - mContentOffset;
return PR_TRUE;
}
}
*aOffset = contentLength;
}
return PR_FALSE;
}
PRBool
ClusterIterator::IsWhitespace()
{
NS_ASSERTION(mCharIndex >= 0, "No cluster selected");
return IsSelectionSpace(mFrag, mCharIndex);
}
PRBool
ClusterIterator::IsPunctuation()
{
NS_ASSERTION(mCharIndex >= 0, "No cluster selected");
if (!mCategories)
return PR_FALSE;
nsIUGenCategory::nsUGenCategory c = mCategories->Get(mFrag->CharAt(mCharIndex));
return c == nsIUGenCategory::kPunctuation || c == nsIUGenCategory::kSymbol;
}
PRInt32
ClusterIterator::GetBeforeOffset()
{
NS_ASSERTION(mCharIndex >= 0, "No cluster selected");
return mCharIndex + (mDirection > 0 ? 0 : 1);
}
PRInt32
ClusterIterator::GetAfterOffset()
{
NS_ASSERTION(mCharIndex >= 0, "No cluster selected");
return mCharIndex + (mDirection > 0 ? 1 : 0);
}
PRBool
ClusterIterator::NextCluster()
{
if (!mDirection)
return PR_FALSE;
gfxTextRun* textRun = mTextFrame->GetTextRun();
mHaveWordBreak = PR_FALSE;
while (PR_TRUE) {
PRBool keepGoing = PR_FALSE;
if (mDirection > 0) {
if (mIterator.GetOriginalOffset() >= mTrimmed.GetEnd())
return PR_FALSE;
keepGoing = mIterator.IsOriginalCharSkipped() ||
mIterator.GetOriginalOffset() < mTrimmed.mStart ||
!textRun->IsClusterStart(mIterator.GetSkippedOffset());
mCharIndex = mIterator.GetOriginalOffset();
mIterator.AdvanceOriginal(1);
} else {
if (mIterator.GetOriginalOffset() <= mTrimmed.mStart)
return PR_FALSE;
mIterator.AdvanceOriginal(-1);
keepGoing = mIterator.IsOriginalCharSkipped() ||
mIterator.GetOriginalOffset() >= mTrimmed.GetEnd() ||
!textRun->IsClusterStart(mIterator.GetSkippedOffset());
mCharIndex = mIterator.GetOriginalOffset();
}
if (mWordBreaks[GetBeforeOffset() - mTextFrame->GetContentOffset()]) {
mHaveWordBreak = PR_TRUE;
}
if (!keepGoing)
return PR_TRUE;
}
}
ClusterIterator::ClusterIterator(nsTextFrame* aTextFrame, PRInt32 aPosition,
PRInt32 aDirection, nsString& aContext)
: mTextFrame(aTextFrame), mDirection(aDirection), mCharIndex(-1)
{
mIterator = aTextFrame->EnsureTextRun();
if (!aTextFrame->GetTextRun()) {
mDirection = 0; // signal failure
return;
}
mIterator.SetOriginalOffset(aPosition);
mCategories = do_GetService(NS_UNICHARCATEGORY_CONTRACTID);
mFrag = aTextFrame->GetContent()->GetText();
mTrimmed = aTextFrame->GetTrimmedOffsets(mFrag, PR_TRUE);
PRInt32 textOffset = aTextFrame->GetContentOffset();
PRInt32 textLen = aTextFrame->GetContentLength();
if (!mWordBreaks.AppendElements(textLen + 1)) {
mDirection = 0; // signal failure
return;
}
memset(mWordBreaks.Elements(), PR_FALSE, textLen + 1);
PRInt32 textStart;
if (aDirection > 0) {
if (aContext.IsEmpty()) {
// No previous context, so it must be the start of a line or text run
mWordBreaks[0] = PR_TRUE;
}
textStart = aContext.Length();
mFrag->AppendTo(aContext, textOffset, textLen);
} else {
if (aContext.IsEmpty()) {
// No following context, so it must be the end of a line or text run
mWordBreaks[textLen] = PR_TRUE;
}
textStart = 0;
nsAutoString str;
mFrag->AppendTo(str, textOffset, textLen);
aContext.Insert(str, 0);
}
nsIWordBreaker* wordBreaker = nsContentUtils::WordBreaker();
PRInt32 i;
for (i = 0; i <= textLen; ++i) {
PRInt32 indexInText = i + textStart;
mWordBreaks[i] |=
wordBreaker->BreakInBetween(aContext.get(), indexInText,
aContext.get() + indexInText,
aContext.Length() - indexInText);
}
}
PRBool
nsTextFrame::PeekOffsetWord(PRBool aForward, PRBool aWordSelectEatSpace, PRBool aIsKeyboardSelect,
PRInt32* aOffset, PeekWordState* aState)
{
PRInt32 contentLength = GetContentLength();
NS_ASSERTION (aOffset && *aOffset <= contentLength, "aOffset out of range");
PRBool selectable;
PRUint8 selectStyle;
IsSelectable(&selectable, &selectStyle);
if (selectStyle == NS_STYLE_USER_SELECT_ALL)
return PR_FALSE;
PRInt32 offset = GetContentOffset() + (*aOffset < 0 ? contentLength : *aOffset);
ClusterIterator cIter(this, offset, aForward ? 1 : -1, aState->mContext);
if (!cIter.NextCluster())
return PR_FALSE;
do {
PRBool isPunctuation = cIter.IsPunctuation();
PRBool isWhitespace = cIter.IsWhitespace();
PRBool isWordBreakBefore = cIter.HaveWordBreakBefore();
if (aWordSelectEatSpace == isWhitespace && !aState->mSawBeforeType) {
aState->SetSawBeforeType();
aState->Update(isPunctuation, isWhitespace);
continue;
}
// See if we can break before the current cluster
if (!aState->mAtStart) {
PRBool canBreak;
if (isPunctuation != aState->mLastCharWasPunctuation) {
canBreak = BreakWordBetweenPunctuation(aState, aForward,
isPunctuation, isWhitespace, aIsKeyboardSelect);
} else if (!aState->mLastCharWasWhitespace &&
!isWhitespace && !isPunctuation && isWordBreakBefore) {
// if both the previous and the current character are not white
// space but this can be word break before, we don't need to eat
// a white space in this case. This case happens in some languages
// that their words are not separated by white spaces. E.g.,
// Japanese and Chinese.
canBreak = PR_TRUE;
} else {
canBreak = isWordBreakBefore && aState->mSawBeforeType;
}
if (canBreak) {
*aOffset = cIter.GetBeforeOffset() - mContentOffset;
return PR_TRUE;
}
}
aState->Update(isPunctuation, isWhitespace);
} while (cIter.NextCluster());
*aOffset = cIter.GetAfterOffset() - mContentOffset;
return PR_FALSE;
}
// TODO this needs to be deCOMtaminated with the interface fixed in
// nsIFrame.h, but we won't do that until the old textframe is gone.
NS_IMETHODIMP
nsTextFrame::CheckVisibility(nsPresContext* aContext, PRInt32 aStartIndex,
PRInt32 aEndIndex, PRBool aRecurse, PRBool *aFinished, PRBool *aRetval)
{
if (!aRetval)
return NS_ERROR_NULL_POINTER;
// Text in the range is visible if there is at least one character in the range
// that is not skipped and is mapped by this frame (which is the primary frame)
// or one of its continuations.
for (nsTextFrame* f = this; f;
f = static_cast<nsTextFrame*>(GetNextContinuation())) {
if (f->PeekOffsetNoAmount(PR_TRUE, nsnull)) {
*aRetval = PR_TRUE;
return NS_OK;
}
}
*aRetval = PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP
nsTextFrame::GetOffsets(PRInt32 &start, PRInt32 &end) const
{
start = GetContentOffset();
end = GetContentEnd();
return NS_OK;
}
static PRInt32
FindEndOfPunctuationRun(const nsTextFragment* aFrag,
gfxTextRun* aTextRun,
gfxSkipCharsIterator* aIter,
PRInt32 aOffset,
PRInt32 aStart,
PRInt32 aEnd)
{
PRInt32 i;
for (i = aStart; i < aEnd - aOffset; ++i) {
if (nsContentUtils::IsPunctuationMarkAt(aFrag, aOffset + i)) {
aIter->SetOriginalOffset(aOffset + i);
FindClusterEnd(aTextRun, aEnd, aIter);
i = aIter->GetOriginalOffset() - aOffset;
} else {
break;
}
}
return i;
}
/**
* Returns PR_TRUE if this text frame completes the first-letter, PR_FALSE
* if it does not contain a true "letter".
* If returns PR_TRUE, then it also updates aLength to cover just the first-letter
* text.
*
* XXX :first-letter should be handled during frame construction
* (and it has a good bit in common with nextBidi)
*
* @param aLength an in/out parameter: on entry contains the maximum length to
* return, on exit returns length of the first-letter fragment (which may
* include leading and trailing punctuation, for example)
*/
static PRBool
FindFirstLetterRange(const nsTextFragment* aFrag,
gfxTextRun* aTextRun,
PRInt32 aOffset, const gfxSkipCharsIterator& aIter,
PRInt32* aLength)
{
PRInt32 i;
PRInt32 length = *aLength;
PRInt32 endOffset = aOffset + length;
gfxSkipCharsIterator iter(aIter);
// skip leading whitespace, then consume clusters that start with punctuation
i = FindEndOfPunctuationRun(aFrag, aTextRun, &iter, aOffset,
GetTrimmableWhitespaceCount(aFrag, aOffset, length, 1),
endOffset);
if (i == length)
return PR_FALSE;
// If the next character is not a letter or number, there is no first-letter.
// Return PR_TRUE so that we don't go on looking, but set aLength to 0.
if (!nsContentUtils::IsAlphanumericAt(aFrag, aOffset + i)) {
*aLength = 0;
return PR_TRUE;
}
// consume another cluster (the actual first letter)
iter.SetOriginalOffset(aOffset + i);
FindClusterEnd(aTextRun, endOffset, &iter);
i = iter.GetOriginalOffset() - aOffset;
if (i + 1 == length)
return PR_TRUE;
// consume clusters that start with punctuation
i = FindEndOfPunctuationRun(aFrag, aTextRun, &iter, aOffset, i + 1, endOffset);
if (i < length)
*aLength = i;
return PR_TRUE;
}
static PRUint32
FindStartAfterSkippingWhitespace(PropertyProvider* aProvider,
nsIFrame::InlineIntrinsicWidthData* aData,
PRBool aCollapseWhitespace,
gfxSkipCharsIterator* aIterator,
PRUint32 aFlowEndInTextRun)
{
if (aData->skipWhitespace && aCollapseWhitespace) {
while (aIterator->GetSkippedOffset() < aFlowEndInTextRun &&
IsTrimmableSpace(aProvider->GetFragment(), aIterator->GetOriginalOffset())) {
aIterator->AdvanceOriginal(1);
}
}
return aIterator->GetSkippedOffset();
}
/* virtual */
void nsTextFrame::MarkIntrinsicWidthsDirty()
{
ClearTextRun();
nsFrame::MarkIntrinsicWidthsDirty();
}
// XXX this doesn't handle characters shaped by line endings. We need to
// temporarily override the "current line ending" settings.
void
nsTextFrame::AddInlineMinWidthForFlow(nsIRenderingContext *aRenderingContext,
nsIFrame::InlineMinWidthData *aData)
{
PRUint32 flowEndInTextRun;
gfxContext* ctx = aRenderingContext->ThebesContext();
gfxSkipCharsIterator iter =
EnsureTextRun(ctx, nsnull, aData->line, &flowEndInTextRun);
if (!mTextRun)
return;
// Pass null for the line container. This will disable tab spacing, but that's
// OK since we can't really handle tabs for intrinsic sizing anyway.
const nsTextFragment* frag = mContent->GetText();
PropertyProvider provider(mTextRun, GetStyleText(), frag, this,
iter, PR_INT32_MAX, nsnull, 0);
PRBool collapseWhitespace = !provider.GetStyleText()->WhiteSpaceIsSignificant();
PRUint32 start =
FindStartAfterSkippingWhitespace(&provider, aData, collapseWhitespace,
&iter, flowEndInTextRun);
if (start >= flowEndInTextRun)
return;
// XXX Should we consider hyphenation here?
for (PRUint32 i = start, wordStart = start; i <= flowEndInTextRun; ++i) {
PRBool preformattedNewline = PR_FALSE;
if (i < flowEndInTextRun) {
// XXXldb Shouldn't we be including the newline as part of the
// segment that it ends rather than part of the segment that it
// starts?
preformattedNewline = !collapseWhitespace && mTextRun->GetChar(i) == '\n';
if (!mTextRun->CanBreakLineBefore(i) && !preformattedNewline) {
// we can't break here (and it's not the end of the flow)
continue;
}
}
if (i > wordStart) {
nscoord width =
NSToCoordCeil(mTextRun->GetAdvanceWidth(wordStart, i - wordStart, &provider));
aData->currentLine += width;
aData->atStartOfLine = PR_FALSE;
if (collapseWhitespace) {
PRUint32 trimStart = GetEndOfTrimmedText(frag, wordStart, i, &iter);
if (trimStart == start) {
// This is *all* trimmable whitespace, so whatever trailingWhitespace
// we saw previously is still trailing...
aData->trailingWhitespace += width;
} else {
// Some non-whitespace so the old trailingWhitespace is no longer trailing
aData->trailingWhitespace =
NSToCoordCeil(mTextRun->GetAdvanceWidth(trimStart, i - trimStart, &provider));
}
} else {
aData->trailingWhitespace = 0;
}
}
if (i < flowEndInTextRun ||
(i == mTextRun->GetLength() &&
(mTextRun->GetFlags() & nsTextFrameUtils::TEXT_HAS_TRAILING_BREAK))) {
if (preformattedNewline) {
aData->ForceBreak(aRenderingContext);
} else {
aData->OptionallyBreak(aRenderingContext);
}
wordStart = i;
}
}
// Check if we have collapsible whitespace at the end
aData->skipWhitespace =
IsTrimmableSpace(provider.GetFragment(), provider.GetStyleText(),
iter.ConvertSkippedToOriginal(flowEndInTextRun - 1));
}
// XXX Need to do something here to avoid incremental reflow bugs due to
// first-line and first-letter changing min-width
/* virtual */ void
nsTextFrame::AddInlineMinWidth(nsIRenderingContext *aRenderingContext,
nsIFrame::InlineMinWidthData *aData)
{
nsTextFrame* f;
gfxTextRun* lastTextRun = nsnull;
// nsContinuingTextFrame does nothing for AddInlineMinWidth; all text frames
// in the flow are handled right here.
for (f = this; f; f = static_cast<nsTextFrame*>(f->GetNextContinuation())) {
// f->mTextRun could be null if we haven't set up textruns yet for f.
// Except in OOM situations, lastTextRun will only be null for the first
// text frame.
if (f == this || f->mTextRun != lastTextRun) {
// This will process all the text frames that share the same textrun as f.
f->AddInlineMinWidthForFlow(aRenderingContext, aData);
lastTextRun = f->mTextRun;
}
}
}
// XXX this doesn't handle characters shaped by line endings. We need to
// temporarily override the "current line ending" settings.
void
nsTextFrame::AddInlinePrefWidthForFlow(nsIRenderingContext *aRenderingContext,
nsIFrame::InlinePrefWidthData *aData)
{
PRUint32 flowEndInTextRun;
gfxContext* ctx = aRenderingContext->ThebesContext();
gfxSkipCharsIterator iter =
EnsureTextRun(ctx, nsnull, aData->line, &flowEndInTextRun);
if (!mTextRun)
return;
// Pass null for the line container. This will disable tab spacing, but that's
// OK since we can't really handle tabs for intrinsic sizing anyway.
PropertyProvider provider(mTextRun, GetStyleText(), mContent->GetText(), this,
iter, PR_INT32_MAX, nsnull, 0);
PRBool collapseWhitespace = !provider.GetStyleText()->WhiteSpaceIsSignificant();
PRUint32 start =
FindStartAfterSkippingWhitespace(&provider, aData, collapseWhitespace,
&iter, flowEndInTextRun);
if (start >= flowEndInTextRun)
return;
if (collapseWhitespace) {
// \n line breaks are not honoured, so everything would like to go
// onto one line, so just measure it
nscoord width =
NSToCoordCeil(mTextRun->GetAdvanceWidth(start, flowEndInTextRun - start, &provider));
aData->currentLine = NSCoordSaturatingAdd(aData->currentLine, width);
PRUint32 trimStart = GetEndOfTrimmedText(provider.GetFragment(), start,
flowEndInTextRun, &iter);
if (trimStart == start) {
// This is *all* trimmable whitespace, so whatever trailingWhitespace
// we saw previously is still trailing...
aData->trailingWhitespace += width;
} else {
// Some non-whitespace so the old trailingWhitespace is no longer trailing
aData->trailingWhitespace =
NSToCoordCeil(mTextRun->GetAdvanceWidth(trimStart, flowEndInTextRun - trimStart, &provider));
}
} else {
// We respect line breaks, so measure off each line (or part of line).
aData->trailingWhitespace = 0;
PRUint32 i;
PRUint32 startRun = start;
for (i = start; i <= flowEndInTextRun; ++i) {
if (i < flowEndInTextRun && mTextRun->GetChar(i) != '\n')
continue;
aData->currentLine +=
NSToCoordCeil(mTextRun->GetAdvanceWidth(startRun, i - startRun, &provider));
if (i < flowEndInTextRun) {
aData->ForceBreak(aRenderingContext);
startRun = i;
}
}
}
// Check if we have collapsible whitespace at the end
aData->skipWhitespace =
IsTrimmableSpace(provider.GetFragment(), provider.GetStyleText(),
iter.ConvertSkippedToOriginal(flowEndInTextRun - 1));
}
// XXX Need to do something here to avoid incremental reflow bugs due to
// first-line and first-letter changing pref-width
/* virtual */ void
nsTextFrame::AddInlinePrefWidth(nsIRenderingContext *aRenderingContext,
nsIFrame::InlinePrefWidthData *aData)
{
nsTextFrame* f;
gfxTextRun* lastTextRun = nsnull;
// nsContinuingTextFrame does nothing for AddInlineMinWidth; all text frames
// in the flow are handled right here.
for (f = this; f; f = static_cast<nsTextFrame*>(f->GetNextContinuation())) {
// f->mTextRun could be null if we haven't set up textruns yet for f.
// Except in OOM situations, lastTextRun will only be null for the first
// text frame.
if (f == this || f->mTextRun != lastTextRun) {
// This will process all the text frames that share the same textrun as f.
f->AddInlinePrefWidthForFlow(aRenderingContext, aData);
lastTextRun = f->mTextRun;
}
}
}
/* virtual */ nsSize
nsTextFrame::ComputeSize(nsIRenderingContext *aRenderingContext,
nsSize aCBSize, nscoord aAvailableWidth,
nsSize aMargin, nsSize aBorder, nsSize aPadding,
PRBool aShrinkWrap)
{
// Inlines and text don't compute size before reflow.
return nsSize(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
static nsRect
RoundOut(const gfxRect& aRect)
{
nsRect r;
r.x = NSToCoordFloor(aRect.X());
r.y = NSToCoordFloor(aRect.Y());
r.width = NSToCoordCeil(aRect.XMost()) - r.x;
r.height = NSToCoordCeil(aRect.YMost()) - r.y;
return r;
}
nsRect
nsTextFrame::ComputeTightBounds(gfxContext* aContext) const
{
if ((GetStyleContext()->HasTextDecorations() &&
eCompatibility_NavQuirks == PresContext()->CompatibilityMode()) ||
(GetStateBits() & TEXT_HYPHEN_BREAK)) {
// This is conservative, but OK.
return GetOverflowRect();
}
gfxSkipCharsIterator iter = const_cast<nsTextFrame*>(this)->EnsureTextRun();
if (!mTextRun)
return nsRect(0, 0, 0, 0);
PropertyProvider provider(const_cast<nsTextFrame*>(this), iter);
// Trim trailing whitespace
provider.InitializeForDisplay(PR_TRUE);
gfxTextRun::Metrics metrics =
mTextRun->MeasureText(provider.GetStart().GetSkippedOffset(),
ComputeTransformedLength(provider), PR_TRUE,
aContext, &provider);
// mAscent should be the same as metrics.mAscent, but it's what we use to
// paint so that's the one we'll use.
return RoundOut(metrics.mBoundingBox) + nsPoint(0, mAscent);
}
static void
AddCharToMetrics(gfxTextRun* aCharTextRun, gfxTextRun* aBaseTextRun,
gfxTextRun::Metrics* aMetrics, PRBool aTightBoundingBox,
gfxContext* aContext)
{
gfxRect charRect;
// assume char does not overflow font metrics!!!
gfxFloat width = aCharTextRun->GetAdvanceWidth(0, aCharTextRun->GetLength(), nsnull);
if (aTightBoundingBox) {
gfxTextRun::Metrics charMetrics =
aCharTextRun->MeasureText(0, aCharTextRun->GetLength(), PR_TRUE, aContext, nsnull);
charRect = charMetrics.mBoundingBox;
} else {
charRect = gfxRect(0, -aMetrics->mAscent, width,
aMetrics->mAscent + aMetrics->mDescent);
}
if (aBaseTextRun->IsRightToLeft()) {
// Char comes before text, so the bounding box is moved to the
// right by aWidth
aMetrics->mBoundingBox.MoveBy(gfxPoint(width, 0));
} else {
// char is moved to the right by mAdvanceWidth
charRect.MoveBy(gfxPoint(width, 0));
}
aMetrics->mBoundingBox = aMetrics->mBoundingBox.Union(charRect);
aMetrics->mAdvanceWidth += width;
}
static PRBool
HasSoftHyphenBefore(const nsTextFragment* aFrag, gfxTextRun* aTextRun,
PRInt32 aStartOffset, const gfxSkipCharsIterator& aIter)
{
if (!(aTextRun->GetFlags() & nsTextFrameUtils::TEXT_HAS_SHY))
return PR_FALSE;
gfxSkipCharsIterator iter = aIter;
while (iter.GetOriginalOffset() > aStartOffset) {
iter.AdvanceOriginal(-1);
if (!iter.IsOriginalCharSkipped())
break;
if (aFrag->CharAt(iter.GetOriginalOffset()) == CH_SHY)
return PR_TRUE;
}
return PR_FALSE;
}
void
nsTextFrame::SetLength(PRInt32 aLength)
{
mContentLengthHint = aLength;
PRInt32 end = GetContentOffset() + aLength;
nsTextFrame* f = static_cast<nsTextFrame*>(GetNextInFlow());
if (!f)
return;
if (end < f->mContentOffset) {
// Our frame is shrinking. Give the text to our next in flow.
f->mContentOffset = end;
if (f->GetTextRun() != mTextRun) {
ClearTextRun();
f->ClearTextRun();
}
return;
}
while (f && f->mContentOffset < end) {
// Our frame is growing. Take text from our in-flow.
f->mContentOffset = end;
if (f->GetTextRun() != mTextRun) {
ClearTextRun();
f->ClearTextRun();
}
f = static_cast<nsTextFrame*>(f->GetNextInFlow());
}
#ifdef DEBUG
f = static_cast<nsTextFrame*>(this->GetFirstContinuation());
while (f) {
f->GetContentLength(); // Assert if negative length
f = static_cast<nsTextFrame*>(f->GetNextContinuation());
}
#endif
}
PRBool
nsTextFrame::IsFloatingFirstLetterChild()
{
if (!GetStateBits() & TEXT_FIRST_LETTER)
return PR_FALSE;
nsIFrame* frame = GetParent();
if (!frame || frame->GetType() != nsGkAtoms::letterFrame)
return PR_FALSE;
return frame->GetStyleDisplay()->IsFloating();
}
NS_IMETHODIMP
nsTextFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsTextFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aStatus);
#ifdef NOISY_REFLOW
ListTag(stdout);
printf(": BeginReflow: availableSize=%d,%d\n",
aReflowState.availableWidth, aReflowState.availableHeight);
#endif
/////////////////////////////////////////////////////////////////////
// Set up flags and clear out state
/////////////////////////////////////////////////////////////////////
// Clear out the reflow state flags in mState (without destroying
// the TEXT_BLINK_ON bit). We also clear the whitespace flags because this
// can change whether the frame maps whitespace-only text or not.
RemoveStateBits(TEXT_REFLOW_FLAGS | TEXT_WHITESPACE_FLAGS);
// Temporarily map all possible content while we construct our new textrun.
// so that when doing reflow our styles prevail over any part of the
// textrun we look at. Note that next-in-flows may be mapping the same
// content; gfxTextRun construction logic will ensure that we take priority.
PRInt32 maxContentLength = GetInFlowContentLength();
// XXX If there's no line layout, we shouldn't even have created this
// frame. This may happen if, for example, this is text inside a table
// but not inside a cell. For now, just don't reflow. We also don't need to
// reflow if there is no content.
if (!aReflowState.mLineLayout || !maxContentLength) {
ClearMetrics(aMetrics);
aStatus = NS_FRAME_COMPLETE;
return NS_OK;
}
nsLineLayout& lineLayout = *aReflowState.mLineLayout;
if (aPresContext->BidiEnabled()) {
// SetIsBidiSystem should go away at some point since we're going to require
// it to be effectively always true
aPresContext->SetIsBidiSystem(PR_TRUE);
}
if (aReflowState.mFlags.mBlinks) {
if (0 == (mState & TEXT_BLINK_ON)) {
mState |= TEXT_BLINK_ON;
nsBlinkTimer::AddBlinkFrame(aPresContext, this);
}
}
else {
if (0 != (mState & TEXT_BLINK_ON)) {
mState &= ~TEXT_BLINK_ON;
nsBlinkTimer::RemoveBlinkFrame(this);
}
}
const nsStyleText* textStyle = GetStyleText();
PRBool atStartOfLine = lineLayout.LineIsEmpty();
if (atStartOfLine) {
AddStateBits(TEXT_START_OF_LINE);
}
PRUint32 flowEndInTextRun;
nsIFrame* lineContainer = lineLayout.GetLineContainerFrame();
gfxContext* ctx = aReflowState.rendContext->ThebesContext();
const nsTextFragment* frag = mContent->GetText();
// DOM offsets of the text range we need to measure, after trimming
// whitespace, restricting to first-letter, and restricting preformatted text
// to nearest newline
PRInt32 length = maxContentLength;
PRInt32 offset = GetContentOffset();
// Restrict preformatted text to the nearest newline
PRInt32 newLineOffset = -1; // this will be -1 or a content offset
if (textStyle->WhiteSpaceIsSignificant()) {
newLineOffset = FindChar(frag, offset, length, '\n');
if (newLineOffset >= 0) {
length = newLineOffset + 1 - offset;
}
} else {
if (atStartOfLine) {
// Skip leading whitespace
PRInt32 whitespaceCount = GetTrimmableWhitespaceCount(frag, offset, length, 1);
offset += whitespaceCount;
length -= whitespaceCount;
}
}
PRBool completedFirstLetter = PR_FALSE;
// Layout dependent styles are a problem because we need to reconstruct
// the gfxTextRun based on our layout.
if (lineLayout.GetFirstLetterStyleOK() || lineLayout.GetInFirstLine()) {
SetLength(maxContentLength);
if (lineLayout.GetFirstLetterStyleOK()) {
// floating first-letter boundaries are significant in textrun
// construction, so clear the textrun out every time we hit a first-letter
// and have changed our length (which controls the first-letter boundary)
ClearTextRun();
// Find the length of the first-letter. We need a textrun for this.
gfxSkipCharsIterator iter =
EnsureTextRun(ctx, lineContainer, lineLayout.GetLine(), &flowEndInTextRun);
if (mTextRun) {
completedFirstLetter = FindFirstLetterRange(frag, mTextRun, offset, iter, &length);
if (length) {
AddStateBits(TEXT_FIRST_LETTER);
}
// Change this frame's length to the first-letter length right now
// so that when we rebuild the textrun it will be built with the
// right first-letter boundary
SetLength(offset + length - GetContentOffset());
// Ensure that the textrun will be rebuilt
ClearTextRun();
}
}
}
gfxSkipCharsIterator iter =
EnsureTextRun(ctx, lineContainer, lineLayout.GetLine(), &flowEndInTextRun);
PRInt32 skippedRunLength;
if (mTextRun && mTextRun->GetLength() == iter.GetSkippedOffset() &&
length > 0 &&
(!iter.IsOriginalCharSkipped(&skippedRunLength) || skippedRunLength < length)) {
// The textrun does not map enough text for this frame. This can happen
// when the textrun was ended in the middle of a text node because a
// preformatted newline was encountered, and prev-in-flow frames have
// consumed all the text of the textrun. We need a new textrun.
ClearTextRun();
iter = EnsureTextRun(ctx, lineContainer,
lineLayout.GetLine(), &flowEndInTextRun);
}
if (!mTextRun) {
ClearMetrics(aMetrics);
aStatus = NS_FRAME_COMPLETE;
return NS_OK;
}
NS_ASSERTION(gfxSkipCharsIterator(iter).ConvertOriginalToSkipped(offset + length)
<= mTextRun->GetLength(),
"Text run does not map enough text for our reflow");
/////////////////////////////////////////////////////////////////////
// See how much text should belong to this text frame, and measure it
/////////////////////////////////////////////////////////////////////
iter.SetOriginalOffset(offset);
nscoord xOffsetForTabs = (mTextRun->GetFlags() & nsTextFrameUtils::TEXT_HAS_TAB) ?
(lineLayout.GetCurrentFrameXDistanceFromBlock() -
lineContainer->GetUsedBorderAndPadding().left)
: -1;
PropertyProvider provider(mTextRun, textStyle, frag, this, iter, length,
lineContainer, xOffsetForTabs);
PRUint32 transformedOffset = provider.GetStart().GetSkippedOffset();
// The metrics for the text go in here
gfxTextRun::Metrics textMetrics;
PRBool needTightBoundingBox = IsFloatingFirstLetterChild();
#ifdef MOZ_MATHML
NS_ASSERTION(!(NS_REFLOW_CALC_BOUNDING_METRICS & aMetrics.mFlags),
"We shouldn't be passed NS_REFLOW_CALC_BOUNDING_METRICS anymore");
#endif
PRInt32 limitLength = length;
PRInt32 forceBreak = lineLayout.GetForcedBreakPosition(mContent);
PRBool forceBreakAfter = PR_FALSE;
if (forceBreak >= offset + length) {
forceBreakAfter = forceBreak == offset + length;
// The break is not within the text considered for this textframe.
forceBreak = -1;
}
if (forceBreak >= 0) {
limitLength = forceBreak - offset;
NS_ASSERTION(limitLength >= 0, "Weird break found!");
}
// This is the heart of text reflow right here! We don't know where
// to break, so we need to see how much text fits in the available width.
PRUint32 transformedLength;
if (offset + limitLength >= PRInt32(frag->GetLength())) {
NS_ASSERTION(offset + limitLength == PRInt32(frag->GetLength()),
"Content offset/length out of bounds");
NS_ASSERTION(flowEndInTextRun >= transformedOffset,
"Negative flow length?");
transformedLength = flowEndInTextRun - transformedOffset;
} else {
// we're not looking at all the content, so we need to compute the
// length of the transformed substring we're looking at
gfxSkipCharsIterator iter(provider.GetStart());
iter.SetOriginalOffset(offset + limitLength);
transformedLength = iter.GetSkippedOffset() - transformedOffset;
}
PRUint32 transformedLastBreak = 0;
PRBool usedHyphenation;
gfxFloat trimmedWidth = 0;
gfxFloat availWidth = aReflowState.availableWidth;
PRBool canTrimTrailingWhitespace = !textStyle->WhiteSpaceIsSignificant();
PRInt32 unusedOffset;
gfxBreakPriority breakPriority;
lineLayout.GetLastOptionalBreakPosition(&unusedOffset, &breakPriority);
PRUint32 transformedCharsFit =
mTextRun->BreakAndMeasureText(transformedOffset, transformedLength,
(GetStateBits() & TEXT_START_OF_LINE) != 0,
availWidth,
&provider, !lineLayout.LineIsBreakable(),
canTrimTrailingWhitespace ? &trimmedWidth : nsnull,
&textMetrics, needTightBoundingBox, ctx,
&usedHyphenation, &transformedLastBreak,
textStyle->WordCanWrap(), &breakPriority);
// The "end" iterator points to the first character after the string mapped
// by this frame. Basically, its original-string offset is offset+charsFit
// after we've computed charsFit.
gfxSkipCharsIterator end(provider.GetEndHint());
end.SetSkippedOffset(transformedOffset + transformedCharsFit);
PRInt32 charsFit = end.GetOriginalOffset() - offset;
if (offset + charsFit == newLineOffset) {
// We broke before a trailing preformatted '\n'. The newline should
// be assigned to this frame. Note that newLineOffset will be -1 if
// there was no preformatted newline, so we wouldn't get here in that
// case.
++charsFit;
}
// That might have taken us beyond our assigned content range (because
// we might have advanced over some skipped chars that extend outside
// this frame), so get back in.
PRInt32 lastBreak = -1;
if (charsFit >= limitLength) {
charsFit = limitLength;
if (transformedLastBreak != PR_UINT32_MAX) {
// lastBreak is needed.
// This may set lastBreak greater than 'length', but that's OK
lastBreak = end.ConvertSkippedToOriginal(transformedOffset + transformedLastBreak);
}
end.SetOriginalOffset(offset + charsFit);
// If we were forced to fit, and the break position is after a soft hyphen,
// note that this is a hyphenation break.
if (forceBreak >= 0 && HasSoftHyphenBefore(frag, mTextRun, offset, end)) {
usedHyphenation = PR_TRUE;
}
}
if (usedHyphenation) {
// Fix up metrics to include hyphen
gfxTextRunCache::AutoTextRun hyphenTextRun(GetHyphenTextRun(mTextRun, ctx, this));
if (hyphenTextRun.get()) {
AddCharToMetrics(hyphenTextRun.get(),
mTextRun, &textMetrics, needTightBoundingBox, ctx);
}
AddStateBits(TEXT_HYPHEN_BREAK);
}
gfxFloat trimmableWidth = 0;
PRBool brokeText = forceBreak >= 0 || transformedCharsFit < transformedLength;
if (canTrimTrailingWhitespace) {
// Optimization: if we trimmed trailing whitespace, and we can be sure
// this frame will be at the end of the line, then leave it trimmed off.
// Otherwise we have to undo the trimming, in case we're not at the end of
// the line. (If we actually do end up at the end of the line, we'll have
// to trim it off again in TrimTrailingWhiteSpace, and we'd like to avoid
// having to re-do it.)
if (brokeText) {
// We're definitely going to break so our trailing whitespace should
// definitely be timmed. Record that we've already done it.
AddStateBits(TEXT_TRIMMED_TRAILING_WHITESPACE);
} else {
// We might not be at the end of the line. (Note that even if this frame
// ends in breakable whitespace, it might not be at the end of the line
// because it might be followed by breakable, but preformatted, whitespace.)
// Undo the trimming.
textMetrics.mAdvanceWidth += trimmedWidth;
trimmableWidth = trimmedWidth;
if (mTextRun->IsRightToLeft()) {
// Space comes before text, so the bounding box is moved to the
// right by trimmdWidth
textMetrics.mBoundingBox.MoveBy(gfxPoint(trimmedWidth, 0));
}
}
}
if (!brokeText && lastBreak >= 0) {
// Since everything fit and no break was forced,
// record the last break opportunity
NS_ASSERTION(textMetrics.mAdvanceWidth - trimmableWidth <= aReflowState.availableWidth,
"If the text doesn't fit, and we have a break opportunity, why didn't MeasureText use it?");
lineLayout.NotifyOptionalBreakPosition(mContent, lastBreak, PR_TRUE, breakPriority);
}
PRInt32 contentLength = offset + charsFit - GetContentOffset();
/////////////////////////////////////////////////////////////////////
// Compute output metrics
/////////////////////////////////////////////////////////////////////
// first-letter frames should use the tight bounding box metrics for ascent/descent
// for good drop-cap effects
if (GetStateBits() & TEXT_FIRST_LETTER) {
textMetrics.mAscent = PR_MAX(0, -textMetrics.mBoundingBox.Y());
textMetrics.mDescent = PR_MAX(0, textMetrics.mBoundingBox.YMost());
}
// Setup metrics for caller
// Disallow negative widths
aMetrics.width = NSToCoordCeil(PR_MAX(0, textMetrics.mAdvanceWidth));
if (transformedCharsFit == 0) {
aMetrics.ascent = 0;
aMetrics.height = 0;
} else if (needTightBoundingBox) {
// Use actual text metrics for floating first letter frame.
aMetrics.ascent = NSToCoordCeil(textMetrics.mAscent);
aMetrics.height = aMetrics.ascent + NSToCoordCeil(textMetrics.mDescent);
} else {
// Otherwise, ascent should contain the overline drawable area.
// And also descent should contain the underline drawable area.
// nsIFontMetrics::GetMaxAscent/GetMaxDescent contains them.
nscoord fontAscent, fontDescent;
nsIFontMetrics* fm = provider.GetFontMetrics();
fm->GetMaxAscent(fontAscent);
fm->GetMaxDescent(fontDescent);
aMetrics.ascent = PR_MAX(NSToCoordCeil(textMetrics.mAscent), fontAscent);
nscoord descent = PR_MAX(NSToCoordCeil(textMetrics.mDescent), fontDescent);
aMetrics.height = aMetrics.ascent + descent;
}
NS_ASSERTION(aMetrics.ascent >= 0, "Negative ascent???");
NS_ASSERTION(aMetrics.height - aMetrics.ascent >= 0, "Negative descent???");
mAscent = aMetrics.ascent;
// Handle text that runs outside its normal bounds.
nsRect boundingBox = RoundOut(textMetrics.mBoundingBox) + nsPoint(0, mAscent);
aMetrics.mOverflowArea.UnionRect(boundingBox,
nsRect(0, 0, aMetrics.width, aMetrics.height));
UnionTextDecorationOverflow(aPresContext, provider, &aMetrics.mOverflowArea);
/////////////////////////////////////////////////////////////////////
// Clean up, update state
/////////////////////////////////////////////////////////////////////
// If all our characters are discarded or collapsed, then trimmable width
// from the last textframe should be preserved. Otherwise the trimmable width
// from this textframe overrides. (Currently in CSS trimmable width can be
// at most one space so there's no way for trimmable width from a previous
// frame to accumulate with trimmable width from this frame.)
if (transformedCharsFit > 0) {
lineLayout.SetTrimmableWidth(NSToCoordFloor(trimmableWidth));
AddStateBits(TEXT_HAS_NONCOLLAPSED_CHARACTERS);
}
if (charsFit > 0 && charsFit == length &&
HasSoftHyphenBefore(frag, mTextRun, offset, end)) {
// Record a potential break after final soft hyphen
lineLayout.NotifyOptionalBreakPosition(mContent, offset + length,
textMetrics.mAdvanceWidth + provider.GetHyphenWidth() <= availWidth,
eNormalBreak);
}
PRBool breakAfter = forceBreakAfter;
if (!breakAfter && charsFit == length &&
transformedOffset + transformedLength == mTextRun->GetLength() &&
(mTextRun->GetFlags() & nsTextFrameUtils::TEXT_HAS_TRAILING_BREAK)) {
// We placed all the text in the textrun and we have a break opportunity at
// the end of the textrun. We need to record it because the following
// content may not care about nsLineBreaker.
// Note that because we didn't break, we can be sure that (thanks to the
// code up above) textMetrics.mAdvanceWidth includes the width of any
// trailing whitespace. So we need to subtract trimmableWidth here
// because if we did break at this point, that much width would be trimmed.
if (textMetrics.mAdvanceWidth - trimmableWidth > availWidth) {
breakAfter = PR_TRUE;
} else {
lineLayout.NotifyOptionalBreakPosition(mContent, offset + length, PR_TRUE,
eNormalBreak);
}
}
if (completedFirstLetter) {
lineLayout.SetFirstLetterStyleOK(PR_FALSE);
}
// Compute reflow status
aStatus = contentLength == maxContentLength
? NS_FRAME_COMPLETE : NS_FRAME_NOT_COMPLETE;
if (charsFit == 0 && length > 0) {
// Couldn't place any text
aStatus = NS_INLINE_LINE_BREAK_BEFORE();
} else if (contentLength > 0 && mContentOffset + contentLength - 1 == newLineOffset) {
// Ends in \n
aStatus = NS_INLINE_LINE_BREAK_AFTER(aStatus);
lineLayout.SetLineEndsInBR(PR_TRUE);
} else if (breakAfter) {
aStatus = NS_INLINE_LINE_BREAK_AFTER(aStatus);
}
if (completedFirstLetter) {
lineLayout.SetFirstLetterStyleOK(PR_FALSE);
aStatus |= NS_INLINE_BREAK_FIRST_LETTER_COMPLETE;
}
// Compute space and letter counts for justification, if required
if (NS_STYLE_TEXT_ALIGN_JUSTIFY == textStyle->mTextAlign &&
!textStyle->WhiteSpaceIsSignificant()) {
// This will include a space for trailing whitespace, if any is present.
// This is corrected for in nsLineLayout::TrimWhiteSpaceIn.
PRInt32 numJustifiableCharacters =
provider.ComputeJustifiableCharacters(offset, charsFit);
NS_ASSERTION(numJustifiableCharacters <= charsFit,
"Bad justifiable character count");
lineLayout.SetTextJustificationWeights(numJustifiableCharacters,
charsFit - numJustifiableCharacters);
}
SetLength(contentLength);
Invalidate(nsRect(nsPoint(0, 0), GetSize()));
#ifdef NOISY_REFLOW
ListTag(stdout);
printf(": desiredSize=%d,%d(b=%d) status=%x\n",
aMetrics.width, aMetrics.height, aMetrics.ascent,
aStatus);
#endif
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aMetrics);
return NS_OK;
}
/* virtual */ PRBool
nsTextFrame::CanContinueTextRun() const
{
// We can continue a text run through a text frame
return PR_TRUE;
}
nsTextFrame::TrimOutput
nsTextFrame::TrimTrailingWhiteSpace(nsIRenderingContext* aRC)
{
TrimOutput result;
result.mChanged = PR_FALSE;
result.mLastCharIsJustifiable = PR_FALSE;
result.mDeltaWidth = 0;
AddStateBits(TEXT_END_OF_LINE);
PRInt32 contentLength = GetContentLength();
if (!contentLength)
return result;
gfxContext* ctx = aRC->ThebesContext();
gfxSkipCharsIterator start = EnsureTextRun(ctx);
NS_ENSURE_TRUE(mTextRun, result);
PRUint32 trimmedStart = start.GetSkippedOffset();
const nsTextFragment* frag = mContent->GetText();
TrimmedOffsets trimmed = GetTrimmedOffsets(frag, PR_TRUE);
gfxSkipCharsIterator trimmedEndIter = start;
const nsStyleText* textStyle = GetStyleText();
gfxFloat delta = 0;
PRUint32 trimmedEnd = trimmedEndIter.ConvertOriginalToSkipped(trimmed.GetEnd());
if (GetStateBits() & TEXT_TRIMMED_TRAILING_WHITESPACE) {
// We pre-trimmed this frame, so the last character is justifiable
result.mLastCharIsJustifiable = PR_TRUE;
} else if (trimmed.GetEnd() < GetContentEnd()) {
gfxSkipCharsIterator end = trimmedEndIter;
PRUint32 endOffset = end.ConvertOriginalToSkipped(GetContentOffset() + contentLength);
if (trimmedEnd < endOffset) {
// We can't be dealing with tabs here ... they wouldn't be trimmed. So it's
// OK to pass null for the line container.
PropertyProvider provider(mTextRun, textStyle, frag, this, start, contentLength,
nsnull, 0);
delta = mTextRun->GetAdvanceWidth(trimmedEnd, endOffset - trimmedEnd, &provider);
// non-compressed whitespace being skipped at end of line -> justifiable
// XXX should we actually *count* justifiable characters that should be
// removed from the overall count? I think so...
result.mLastCharIsJustifiable = PR_TRUE;
result.mChanged = PR_TRUE;
}
}
if (trimmed.GetEnd() == GetContentEnd() &&
HasSoftHyphenBefore(frag, mTextRun, trimmed.mStart, trimmedEndIter)) {
// This is a soft hyphen break.
// Fix up metrics to include hyphen
result.mChanged = PR_TRUE;
gfxTextRunCache::AutoTextRun hyphenTextRun(GetHyphenTextRun(mTextRun, ctx, this));
if (hyphenTextRun.get()) {
delta = -hyphenTextRun->GetAdvanceWidth(0, hyphenTextRun->GetLength(), nsnull);
}
AddStateBits(TEXT_HYPHEN_BREAK);
}
if (!result.mLastCharIsJustifiable &&
NS_STYLE_TEXT_ALIGN_JUSTIFY == textStyle->mTextAlign) {
// Check if any character in the last cluster is justifiable
PropertyProvider provider(mTextRun, textStyle, frag, this, start, contentLength,
nsnull, 0);
PRBool isCJK = IsChineseJapaneseLangGroup(this);
gfxSkipCharsIterator justificationStart(start), justificationEnd(trimmedEndIter);
provider.FindJustificationRange(&justificationStart, &justificationEnd);
PRInt32 i;
for (i = justificationEnd.GetOriginalOffset(); i < trimmed.GetEnd(); ++i) {
if (IsJustifiableCharacter(frag, i, isCJK)) {
result.mLastCharIsJustifiable = PR_TRUE;
}
}
}
gfxFloat advanceDelta;
mTextRun->SetLineBreaks(trimmedStart, trimmedEnd - trimmedStart,
(GetStateBits() & TEXT_START_OF_LINE) != 0, PR_TRUE,
&advanceDelta, ctx);
if (advanceDelta != 0) {
result.mChanged = PR_TRUE;
}
// aDeltaWidth is *subtracted* from our width.
// If advanceDelta is positive then setting the line break made us longer,
// so aDeltaWidth could go negative.
result.mDeltaWidth = NSToCoordFloor(delta - advanceDelta);
// If aDeltaWidth goes negative, that means this frame might not actually fit
// anymore!!! We need higher level line layout to recover somehow.
// If it's because the frame has a soft hyphen that is now being displayed,
// this should actually be OK, because our reflow recorded the break
// opportunity that allowed the soft hyphen to be used, and we wouldn't
// have recorded the opportunity unless the hyphen fit (or was the first
// opportunity on the line).
// Otherwise this can/ really only happen when we have glyphs with special
// shapes at the end of lines, I think. Breaking inside a kerning pair won't
// do it because that would mean we broke inside this textrun, and
// BreakAndMeasureText should make sure the resulting shaped substring fits.
// Maybe if we passed a maxTextLength? But that only happens at direction
// changes (so we wouldn't kern across the boundary) or for first-letter
// (which always fits because it starts the line!).
NS_WARN_IF_FALSE(result.mDeltaWidth >= 0 || (GetStateBits() & TEXT_HYPHEN_BREAK),
"Negative deltawidth in a non-hyphen case, something odd is happening");
#ifdef NOISY_TRIM
ListTag(stdout);
printf(": trim => %d\n", result.mDeltaWidth);
#endif
return result;
}
nsRect
nsTextFrame::RecomputeOverflowRect()
{
gfxSkipCharsIterator iter = EnsureTextRun();
if (!mTextRun)
return nsRect(nsPoint(0,0), GetSize());
PropertyProvider provider(this, iter);
provider.InitializeForDisplay(PR_TRUE);
gfxTextRun::Metrics textMetrics =
mTextRun->MeasureText(provider.GetStart().GetSkippedOffset(),
ComputeTransformedLength(provider), PR_FALSE, nsnull,
&provider);
nsRect boundingBox = RoundOut(textMetrics.mBoundingBox) + nsPoint(0, mAscent);
boundingBox.UnionRect(boundingBox,
nsRect(nsPoint(0,0), GetSize()));
UnionTextDecorationOverflow(PresContext(), provider, &boundingBox);
return boundingBox;
}
static PRUnichar TransformChar(const nsStyleText* aStyle, gfxTextRun* aTextRun,
PRUint32 aSkippedOffset, PRUnichar aChar)
{
if (aChar == '\n' || aChar == '\r') {
return aStyle->WhiteSpaceIsSignificant() ? aChar : ' ';
}
switch (aStyle->mTextTransform) {
case NS_STYLE_TEXT_TRANSFORM_LOWERCASE:
nsContentUtils::GetCaseConv()->ToLower(aChar, &aChar);
break;
case NS_STYLE_TEXT_TRANSFORM_UPPERCASE:
nsContentUtils::GetCaseConv()->ToUpper(aChar, &aChar);
break;
case NS_STYLE_TEXT_TRANSFORM_CAPITALIZE:
if (aTextRun->CanBreakLineBefore(aSkippedOffset)) {
nsContentUtils::GetCaseConv()->ToTitle(aChar, &aChar);
}
break;
}
return aChar;
}
nsresult nsTextFrame::GetRenderedText(nsAString* aAppendToString,
gfxSkipChars* aSkipChars,
gfxSkipCharsIterator* aSkipIter,
PRUint32 aSkippedStartOffset,
PRUint32 aSkippedMaxLength)
{
// The handling of aSkippedStartOffset and aSkippedMaxLength could be more efficient...
gfxSkipCharsBuilder skipCharsBuilder;
nsTextFrame* textFrame;
const nsTextFragment* textFrag = mContent->GetText();
PRUint32 keptCharsLength = 0;
PRUint32 validCharsLength = 0;
// Build skipChars and copy text, for each text frame in this continuation block
for (textFrame = this; textFrame;
textFrame = static_cast<nsTextFrame*>(textFrame->GetNextContinuation())) {
// For each text frame continuation in this block ...
// Ensure the text run and grab the gfxSkipCharsIterator for it
gfxSkipCharsIterator iter = textFrame->EnsureTextRun();
if (!textFrame->mTextRun)
return NS_ERROR_FAILURE;
// Skip to the start of the text run, past ignored chars at start of line
// XXX In the future we may decide to trim extra spaces before a hard line
// break, in which case we need to accurately detect those sitations and
// call GetTrimmedOffsets() with PR_TRUE to trim whitespace at the line's end
TrimmedOffsets trimmedContentOffsets = textFrame->GetTrimmedOffsets(textFrag, PR_FALSE);
PRInt32 startOfLineSkipChars = trimmedContentOffsets.mStart - textFrame->mContentOffset;
if (startOfLineSkipChars > 0) {
skipCharsBuilder.SkipChars(startOfLineSkipChars);
iter.SetOriginalOffset(trimmedContentOffsets.mStart);
}
// Keep and copy the appropriate chars withing the caller's requested range
const nsStyleText* textStyle = textFrame->GetStyleText();
while (iter.GetOriginalOffset() < trimmedContentOffsets.GetEnd() &&
keptCharsLength < aSkippedMaxLength) {
// For each original char from content text
if (iter.IsOriginalCharSkipped() || ++validCharsLength <= aSkippedStartOffset) {
skipCharsBuilder.SkipChar();
} else {
++keptCharsLength;
skipCharsBuilder.KeepChar();
if (aAppendToString) {
aAppendToString->Append(
TransformChar(textStyle, textFrame->mTextRun, iter.GetSkippedOffset(),
textFrag->CharAt(iter.GetOriginalOffset())));
}
}
iter.AdvanceOriginal(1);
}
if (keptCharsLength >= aSkippedMaxLength) {
break; // Already past the end, don't build string or gfxSkipCharsIter anymore
}
}
if (aSkipChars) {
aSkipChars->TakeFrom(&skipCharsBuilder); // Copy skipChars into aSkipChars
if (aSkipIter) {
// Caller must provide both pointers in order to retrieve a gfxSkipCharsIterator,
// because the gfxSkipCharsIterator holds a weak pointer to the gfxSkipCars.
*aSkipIter = gfxSkipCharsIterator(*aSkipChars, GetContentLength());
}
}
return NS_OK;
}
#ifdef DEBUG
// Translate the mapped content into a string that's printable
void
nsTextFrame::ToCString(nsCString& aBuf, PRInt32* aTotalContentLength) const
{
// Get the frames text content
const nsTextFragment* frag = mContent->GetText();
if (!frag) {
return;
}
// Compute the total length of the text content.
*aTotalContentLength = frag->GetLength();
PRInt32 contentLength = GetContentLength();
// Set current fragment and current fragment offset
if (0 == contentLength) {
return;
}
PRInt32 fragOffset = GetContentOffset();
PRInt32 n = fragOffset + contentLength;
while (fragOffset < n) {
PRUnichar ch = frag->CharAt(fragOffset++);
if (ch == '\r') {
aBuf.AppendLiteral("\\r");
} else if (ch == '\n') {
aBuf.AppendLiteral("\\n");
} else if (ch == '\t') {
aBuf.AppendLiteral("\\t");
} else if ((ch < ' ') || (ch >= 127)) {
aBuf.Append(nsPrintfCString("\\u%04x", ch));
} else {
aBuf.Append(ch);
}
}
}
#endif
nsIAtom*
nsTextFrame::GetType() const
{
return nsGkAtoms::textFrame;
}
/* virtual */ PRBool
nsTextFrame::IsEmpty()
{
NS_ASSERTION(!(mState & TEXT_IS_ONLY_WHITESPACE) ||
!(mState & TEXT_ISNOT_ONLY_WHITESPACE),
"Invalid state");
// XXXldb Should this check compatibility mode as well???
if (GetStyleText()->WhiteSpaceIsSignificant()) {
return PR_FALSE;
}
if (mState & TEXT_ISNOT_ONLY_WHITESPACE) {
return PR_FALSE;
}
if (mState & TEXT_IS_ONLY_WHITESPACE) {
return PR_TRUE;
}
PRBool isEmpty = mContent->TextIsOnlyWhitespace();
mState |= (isEmpty ? TEXT_IS_ONLY_WHITESPACE : TEXT_ISNOT_ONLY_WHITESPACE);
return isEmpty;
}
#ifdef DEBUG
NS_IMETHODIMP
nsTextFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("Text"), aResult);
}
NS_IMETHODIMP_(nsFrameState)
nsTextFrame::GetDebugStateBits() const
{
// mask out our emptystate flags; those are just caches
return nsFrame::GetDebugStateBits() &
~(TEXT_WHITESPACE_FLAGS | TEXT_REFLOW_FLAGS);
}
NS_IMETHODIMP
nsTextFrame::List(FILE* out, PRInt32 aIndent) const
{
// Output the tag
IndentBy(out, aIndent);
ListTag(out);
#ifdef DEBUG_waterson
fprintf(out, " [parent=%p]", mParent);
#endif
if (HasView()) {
fprintf(out, " [view=%p]", static_cast<void*>(GetView()));
}
PRInt32 totalContentLength;
nsCAutoString tmp;
ToCString(tmp, &totalContentLength);
// Output the first/last content offset and prev/next in flow info
PRBool isComplete = GetContentEnd() == totalContentLength;
fprintf(out, "[%d,%d,%c] ",
GetContentOffset(), GetContentLength(),
isComplete ? 'T':'F');
if (nsnull != mNextSibling) {
fprintf(out, " next=%p", static_cast<void*>(mNextSibling));
}
nsIFrame* prevContinuation = GetPrevContinuation();
if (nsnull != prevContinuation) {
fprintf(out, " prev-continuation=%p", static_cast<void*>(prevContinuation));
}
if (nsnull != mNextContinuation) {
fprintf(out, " next-continuation=%p", static_cast<void*>(mNextContinuation));
}
// Output the rect and state
fprintf(out, " {%d,%d,%d,%d}", mRect.x, mRect.y, mRect.width, mRect.height);
if (0 != mState) {
if (mState & NS_FRAME_SELECTED_CONTENT) {
fprintf(out, " [state=%08x] SELECTED", mState);
} else {
fprintf(out, " [state=%08x]", mState);
}
}
fprintf(out, " [content=%p]", static_cast<void*>(mContent));
if (GetStateBits() & NS_FRAME_OUTSIDE_CHILDREN) {
nsRect overflowArea = GetOverflowRect();
fprintf(out, " [overflow=%d,%d,%d,%d]", overflowArea.x, overflowArea.y,
overflowArea.width, overflowArea.height);
}
fprintf(out, " sc=%p", static_cast<void*>(mStyleContext));
nsIAtom* pseudoTag = mStyleContext->GetPseudoType();
if (pseudoTag) {
nsAutoString atomString;
pseudoTag->ToString(atomString);
fprintf(out, " pst=%s",
NS_LossyConvertUTF16toASCII(atomString).get());
}
fputs("<\n", out);
// Output the text
aIndent++;
IndentBy(out, aIndent);
fputs("\"", out);
fputs(tmp.get(), out);
fputs("\"\n", out);
aIndent--;
IndentBy(out, aIndent);
fputs(">\n", out);
return NS_OK;
}
#endif
void nsTextFrame::AdjustSelectionPointsForBidi(SelectionDetails *sdptr,
PRInt32 textLength,
PRBool isRTLChars,
PRBool isOddLevel,
PRBool isBidiSystem)
{
/* This adjustment is required whenever the text has been reversed by
* Mozilla before rendering.
*
* In theory this means any text whose Bidi embedding level has been
* set by the Unicode Bidi algorithm to an odd value, but this is
* only true in practice on a non-Bidi platform.
*
* On a Bidi platform the situation is more complicated because the
* platform will automatically reverse right-to-left characters; so
* Mozilla reverses text whose natural directionality is the opposite
* of its embedding level: right-to-left characters whose Bidi
* embedding level is even (e.g. Visual Hebrew) or left-to-right and
* neutral characters whose Bidi embedding level is odd (e.g. English
* text with <bdo dir="rtl">).
*
* The following condition is accordingly an optimization of
* if ( (!isBidiSystem && isOddLevel) ||
* (isBidiSystem &&
* ((isRTLChars && !isOddLevel) ||
* (!isRTLChars && isOddLevel))))
*/
if (isOddLevel ^ (isRTLChars && isBidiSystem)) {
PRInt32 swap = sdptr->mStart;
sdptr->mStart = textLength - sdptr->mEnd;
sdptr->mEnd = textLength - swap;
// temp fix for 75026 crasher until we fix the bidi code
// the above bidi code cause mStart < 0 in some case
// the problem is we have whitespace compression code in
// nsTextTransformer which cause mEnd > textLength
NS_ASSERTION((sdptr->mStart >= 0) , "mStart >= 0");
if(sdptr->mStart < 0 )
sdptr->mStart = 0;
NS_ASSERTION((sdptr->mEnd >= 0) , "mEnd >= 0");
if(sdptr->mEnd < 0 )
sdptr->mEnd = 0;
NS_ASSERTION((sdptr->mStart <= sdptr->mEnd), "mStart <= mEnd");
if(sdptr->mStart > sdptr->mEnd)
sdptr->mEnd = sdptr->mStart;
}
return;
}
void
nsTextFrame::AdjustOffsetsForBidi(PRInt32 aStart, PRInt32 aEnd)
{
AddStateBits(NS_FRAME_IS_BIDI);
/*
* After Bidi resolution we may need to reassign text runs.
* This is called during bidi resolution from the block container, so we
* shouldn't be holding a local reference to a textrun anywhere.
*/
ClearTextRun();
nsTextFrame* prev = static_cast<nsTextFrame*>(GetPrevContinuation());
if (prev) {
// the bidi resolver can be very evil when columns/pages are involved. Don't
// let it violate our invariants.
PRInt32 prevOffset = prev->GetContentOffset();
aStart = PR_MAX(aStart, prevOffset);
aEnd = PR_MAX(aEnd, prevOffset);
prev->ClearTextRun();
}
mContentOffset = aStart;
SetLength(aEnd - aStart);
}
/**
* @return PR_TRUE if this text frame ends with a newline character. It should return
* PR_FALSE if it is not a text frame.
*/
PRBool
nsTextFrame::HasTerminalNewline() const
{
return ::HasTerminalNewline(this);
}
PRBool
nsTextFrame::IsAtEndOfLine() const
{
return (GetStateBits() & TEXT_END_OF_LINE) != 0;
}
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